JP5396894B2 - Portable terminal - Google Patents

Description

  The present invention relates to a portable terminal using a ring buffer or the like as a temporary storage medium for data.

  In mobile terminals such as mobile phones, it is important to reduce the capacity of various data storage media in order to reduce the size and weight of the entire device.

  Conventional portable terminals use a ring buffer or the like with high memory efficiency as a storage medium for temporarily storing data, and only necessary data can be extracted from the temporary storage medium and used. There is. For example, a log management device disclosed in Japanese Patent Laying-Open No. 2005-165932 (Patent Document 1) accumulates history information (hereinafter referred to as a log) during operation of a device in a ring buffer, and a predetermined log is stored from the accumulated log. Log elements that satisfy the conditions (hereinafter referred to as required logs) can be extracted, and the extracted required logs can be transmitted to other devices (log receiving devices) via the network or stored in other devices. It can be stored on a medium.

  According to this log management apparatus, since a storage medium for storing a required log does not require a large-capacity storage medium by using a ring buffer (a temporary storage medium for a log), A small-capacity storage medium such as a flash memory can be used as a storage medium for storage.

JP 2005-165932 A

  By the way, when referring to internal data, the ring buffer cannot grasp what is recorded unless the records are traced in order from the first record (oldest record). For this reason, it can be said that the ring buffer is not suitable for processing such as data search, extraction, and replacement because of its specifications.

  For example, a predetermined amount of records satisfying a predetermined condition from the last record (latest record) to the first record side (oldest record side) as required data among data stored in the ring buffer. Consider when you need it. In this case, in the conventional technique, the control unit (such as a CPU) of the device sequentially retrieves data from the top record, copies all records satisfying a predetermined condition to the work memory, and finally stores a predetermined amount on the work memory. It is necessary to cut out only. At this time, since the total capacity of the records satisfying the predetermined condition is unknown in advance, the control unit (CPU or the like) of the device needs to secure an area having the same capacity as the storage capacity of the ring buffer in the working memory. .

  However, generally, the data required by the user is only a part of the data stored in the ring buffer, and a wasteful area often occurs in the area secured in the working memory.

  The present invention has been made in consideration of the above-described circumstances, and provides a portable terminal capable of securing an area for a required data size in a working memory and extracting required data from a ring buffer. Objective.

  In order to solve the above-described problem, a mobile terminal according to the present invention has a ring buffer composed of a plurality of records storing data elements and a required data element composed of the data elements satisfying a predetermined data type condition. A range in which data is included is determined for the ring buffer as a search range, and a search range determination unit that calculates a capacity of the required data, and a capacity of the required data calculated by the search range determination unit An area securing unit that secures an area of the same capacity in the working memory, and the range determined by the search range determining unit out of the entire range of the ring buffer is extracted to extract the required data, and the extracted data An extraction unit that copies required data to the area of the working memory secured by the area securing unit. A.

  According to the mobile terminal of the present invention, it is possible to secure only an area for a required data size in the working memory and extract the required data from the ring buffer.

1 is a schematic overall configuration diagram showing an embodiment of a mobile terminal according to the present invention. The block diagram which shows schematically the internal structural example of a mobile telephone. Explanatory drawing which shows an example of a mode that a ring buffer is comprised by a record. Explanatory drawing which shows an example of a structure of a record. Explanatory drawing which shows an example of the mode at the time of copying required data from a ring buffer to a working memory by a prior art. The schematic block diagram which shows the structural example of the function implementation part by CPU of a control part. Explanatory drawing which shows an example of a mode at the time of the required data extracted from the search range determined by the search range determination part by the mobile telephone which concerns on this invention being copied to a working memory. The flowchart which shows the procedure at the time of performing the process which ensures only the area | region of the capacity | capacitance same as the capacity | capacitance of required data in a working memory, and extracts required data from a ring buffer by the control part of a mobile telephone. FIG. 9 is a subroutine flowchart illustrating a search range determination process executed by a search range determination unit in step S1 of FIG. FIG. 10 is a subroutine flowchart illustrating a search range adjustment process executed by a search range determination unit in step S <b> 20 of FIG. 9. FIG. (A) is explanatory drawing which shows an example of the search range in case a search start address is a head address, (b) is an explanation which shows an example of a mode that the search start address was changed into the start address of the record next to a head record. FIG. 6 (c) shows that the search start address is the next to this record so as to exclude the record storing the data element of the type satisfying the oldest predetermined condition from the search range so that the accumulated data length is not more than the predetermined capacity. Explanatory drawing which shows an example of a mode changed to the start address of a record. The range determined by the search range determination unit in the entire range of the ring buffer, which is executed by the extraction unit in step S3 in FIG. 8, is searched to extract necessary data (log), and the extracted required log is The subroutine flowchart which shows the procedure at the time of copying to the area | region of the working memory secured by the area securing part.

  Embodiments of a mobile terminal according to the present invention will be described with reference to the accompanying drawings. FIG. 1 is a schematic overall configuration diagram showing an embodiment of a portable terminal according to the present invention. FIG. 1 shows an external view as seen from the front in a state where the portable terminal is open. The present invention can be widely applied to portable terminals using a ring buffer or the like as a temporary data storage medium. In the present embodiment, an example in which a mobile phone is used as the mobile terminal according to the present invention has been described.

  In the following embodiment, an example in which history information (log) during operation of the mobile phone is stored in the ring buffer will be described.

  The cellular phone 10 includes a first casing 11, a second casing 12, and a connecting portion 13 that connects the first casing 11 to the second casing 12 so as to be freely opened and closed.

  As shown in FIG. 1, the first housing 11 is provided with an operation unit 14 and a speaker 15. On the other hand, the second housing 12 is provided with a display unit 16 and a microphone 17.

  The second casing 12 is connected to the first casing 11 via a connecting portion 13 (hinge) so that the second casing 12 can be opened and closed in the direction of the arrow X around the opening / closing axis. When the second casing 12 rotates about the opening / closing axis in the direction of the arrow X, the mobile phone 10 can be positioned in an open state (see FIG. 1) and a closed state.

  The operation unit 14 includes a general input device such as a keyboard, a touch panel, and a numeric keypad, and outputs an operation input signal corresponding to a user operation.

  The speaker 15 generates sound corresponding to various kinds of information including received voice.

  The display unit 16 is configured by a general display output device such as a liquid crystal display or an OLED (Organic Light Emitting Device) display, for example, and displays a background image (wallpaper) of the display unit 16, a remaining battery level and radio waves superimposed on the wallpaper. Various icons such as an image that schematically shows the intensity, and an image and video that are displayed when an incoming call is received are displayed.

  The microphone 17 converts the voice input by the user into a voice signal and transmits the voice.

  FIG. 2 is a block diagram schematically showing an internal configuration example of the mobile phone 10.

  As shown in FIG. 2, the mobile phone 10 further includes an antenna 21, a transmission / reception unit 22, a ring buffer 23 as a temporary storage medium for data, a work memory 24, a storage unit 25, and a control unit 26.

  The antenna 21 transmits and receives communication radio waves to and from a radio base station (not shown).

  The transmission / reception unit 22 is a radio circuit that transmits / receives a radio signal, modulates communication data output from the control unit 26, and transmits the data via the antenna 21. In addition, the communication data received via the antenna 21 is demodulated and output to the main control unit 26. The communication data includes at least voice data for a call and required data (required log) copied to the work memory 24.

  FIG. 3 is an explanatory diagram showing an example of a state in which the ring buffer 23 is composed of records. FIG. 4 is an explanatory diagram showing an example of the structure of a record.

  As shown in FIG. 3, the ring buffer 23 is composed of a plurality of records. As shown in FIG. 4, at least header information is added to each record as data length (capacity) of data stored in each record (hereinafter referred to as data element) and data element type. For example, when the log of the mobile phone 10 is stored in the ring buffer 23, each record of the ring buffer 23 includes a log element output by the operating system, with the data length and type information of the log element as header information. Added and stored.

  Here, the log element type information is classified according to whether it is an event log from the operation unit 14, a status such as a remaining battery level or an alarm function, or a log associated with a fatal error. For example, the information may be information divided into a plurality of levels according to the degree of influence (importance) on the mobile phone 10 such as level 1 to level 5, or a combination of both. May be. In the following description, an example in which the log element types are classified into five levels of level 1 (low importance) to level 5 (high importance) according to the degree of influence (importance) on the mobile phone 10. Show about.

  The ring buffer 23 is controlled by the control unit 26 and can store records storing data elements (log elements, etc.) having various data lengths. When writing to the ring buffer 23, the control unit 26 adds the header information to the address following the latest record so far and stores the data element. Further, when the terminal address of the ring buffer 23 (address at the lower right of the drawing in FIG. 3) is reached, the control unit 26 overwrites the starting address (address at the upper left of the drawing in FIG. 3) of the ring buffer 23. For this reason, the first record, which is a record storing the oldest data element, is not always written from the start address.

  Therefore, in order to read from the ring buffer 23, the control unit 26 requires the start address of the top record (hereinafter referred to as the top address). In addition, the control unit 26 requires the start address of the currently accessed record. The head address and the address being accessed may be stored as, for example, auto variables.

  When searching for data elements stored in all records of the ring buffer 23 in order to read out data elements of a predetermined type from the ring buffer 23, the control unit 26 first accesses the head address and pays attention to the head record. The record (the record to be accessed from now on) is used, and the information on the data length of the first record is acquired from the header information of the first record using the first address as the address of interest. From the information of the head address and the data length of the head record, the start address of the record following the head record can be obtained. Subsequently, the record following the first record is set as the target record, and the data length information of the target record is acquired from the header information of the target record using the start address of the target record as the target address. From the information on the target address and the data length of the target record, the start address of the record following the target record can be obtained. By repeating this, the control unit 26 can finally access the tail record that is a record storing the newest data element.

  That is, the control unit 26 cannot access the ring buffer 23 at random. In order to access a record in which a data element of a predetermined type is stored, the control unit 26 first needs to access the head record and sequentially follow the record from the head record.

  FIG. 5 is an explanatory diagram showing an example of a state when required data is copied from the ring buffer 23 to the work memory 24 by the conventional technique.

  For example, when an unexpected situation occurs in the system, it is possible to identify software or hardware problems by analyzing the log. Conventionally, in a mobile phone that stores a log in the ring buffer 23, the ring buffer 23 was originally made on the assumption that it is acquired from the mobile phone via a wired connection. For this reason, the capacity of the ring buffer 23 is not a size considering wireless communication, but is relatively large.

  However, since a method of acquiring logs via wireless has been widely used recently, a technique for extracting a log that matches a predetermined condition from the ring buffer 23 by a predetermined capacity so as to reduce the network load. Development is desired. This predetermined capacity is often a capacity that is set as an upper limit in advance by a wireless communication protocol used when the mobile phone 10 transmits a log and other specifications. For this reason, even if a log exceeding this predetermined capacity (such as the upper limit size according to the specification) is extracted from the ring buffer 23, it is necessary to adjust the data so that it does not exceed the predetermined capacity.

  In particular, logs that are important for log analysis when an unexpected situation occurs in the system are as close to the present as possible in time series. Therefore, when making adjustments by selecting log elements so that they are less than a predetermined capacity (such as the upper limit size according to specifications), the required logs should be composed of logs that are as close to the present as possible in time series. It is preferable.

  As described above, the user or the administrator of the mobile phone 10 sets, as required data, a predetermined amount of data elements that satisfy a predetermined condition from the last record (latest record) to the first record side (oldest record side). If necessary, in the conventional technique, as shown in FIG. 5, the control unit 26 sequentially retrieves data from the top record, copies all records satisfying a predetermined condition to the work memory 24, and finally finishes the work memory. It is necessary to cut out a predetermined amount on 24. At this time, since the total capacity of records satisfying the predetermined condition is unknown in advance, the control unit 26 needs to secure an area of the same capacity as the storage capacity of the ring buffer 23 in the work memory 24. For this reason, there are many cases where an area that is reserved but is wasted as a result is generated, such as an area other than the area indicated by a thick line in the work memory 24 of FIG.

  However, the work memory 24 of the mobile phone 10 often has a small capacity in order to reduce the size and weight of the entire device. For this reason, the unnecessary occupation of the work memory 24 that occurs when extracting required data from the ring buffer 23 may cause the system to become unstable or cause malfunction.

  Therefore, the mobile phone 10 according to the present embodiment is configured with log elements that are close to the present in time series when extracting log elements that satisfy a predetermined type condition, and the total capacity of the extracted log elements is predetermined. A plurality of log elements (required logs) are extracted so that the capacity is equal to or less than the required capacity, and only an area having the same capacity as the required log capacity is secured in the work memory 24.

  The work memory 24 is constituted by a RAM, for example, and provides a work area for temporarily storing programs and data executed by the CPU. Further, the work memory 24 is controlled by the control unit 26, and necessary data is copied from the ring buffer 23. For this copy, the control unit 26 secures and uses only an area having the same capacity as the required data capacity in the work memory 24 area.

  The storage unit 25 is a nonvolatile memory capable of rewriting data, and stores various data such as e-mail data and music data.

  The control unit 26 is configured by a CPU, a storage medium such as a ROM, and the like, and controls the entire processing of the mobile phone 10 according to a program stored in the storage medium.

  The CPU of the control unit 26 loads a data extraction program stored in a storage medium such as a ROM and data necessary for the execution of the program into the work memory 24, and in accordance with the data extraction program, stores the necessary data. Only a region having the same capacity as that of the capacity is secured in the work memory 24 and processing for extracting required data from the ring buffer 23 is executed. Note that this data extraction program may be incorporated in the BIOS.

  The storage medium such as the ROM of the control unit 26 stores various data necessary for executing various programs including a startup program of the mobile phone 10 and a data extraction program.

  A storage medium such as a ROM has a configuration including a recording medium readable by a CPU, such as a magnetic or optical recording medium or a semiconductor memory, and a part of programs and data in the storage medium. Or you may comprise so that all may be downloaded via an electronic network.

  FIG. 6 is a schematic block diagram illustrating a configuration example of the function realization unit by the CPU of the control unit 26. In addition, this function realization part may be comprised by hardware logics, such as a circuit, without using CPU.

  As illustrated in FIG. 6, the CPU of the control unit 26 functions as at least the search range determination unit 30, the area securing unit 40, and the extraction unit 50 by the data extraction program. Each unit 30, 40 and 50 uses a required work area of the work memory 24 as a temporary storage location for data.

  FIG. 7 is an explanatory diagram showing an example of a state when required data extracted from the search range determined by the search range determination unit 30 of the mobile phone 10 according to the present invention is copied to the work memory 24.

  The search range determination unit 30 includes an attention record setting unit 31, a search start address setting unit 32, a type acquisition unit 33, a type determination unit 34, a data length acquisition unit 35, an integrated data length calculation unit 36, a data capacity determination unit 37, and a tail. A record determination unit 38 is included. The search range determination unit 30 determines, as a search range, the ring buffer 23 as a search range including a required data composed of data elements satisfying a predetermined data type condition as indicated by a thick line on the left of FIG. Calculate the required data capacity.

  The target record setting unit 31 sets the next record to be accessed by the control unit 26 as the target record, and temporarily stores the start address (target address) of the target record in a required work area of the work memory 24 or the like. .

  The search start address setting unit 32 sets the search start address by temporarily storing the search start address in a required work area of the work memory 24 or the like.

  The type acquisition unit 33 acquires information on the type of the data element stored in the currently accessed record.

  The type determination unit 34 determines whether the data type acquired by the type acquisition unit 33 is a type that satisfies a predetermined condition.

  The data length acquisition unit 35 acquires the data length of the currently accessed record.

  The integrated data length calculation unit 36 adds the data length acquired by the data length acquisition unit 35 to the integrated value of the data length temporarily stored in the required work area of the work memory 24 as necessary. Or subtract.

  The integrated data length calculation unit 36 integrates the data length acquired by the data length acquisition unit 35 with the integrated value of the data length temporarily stored in the required work area of the work memory 24, An integrated data length of data elements satisfying a predetermined data type condition is calculated.

  The data capacity determination unit 37 determines whether or not the accumulated data length is equal to or less than a predetermined capacity. For example, when a required log is extracted for wireless transmission, a predetermined capacity for the required log is determined based on an upper limit capacity in the specification related to wireless transmission.

  The tail record determination unit 38 determines whether the record currently being accessed is the tail record by determining whether the next record after the currently accessed record is the head record or the empty record.

  As shown in the right side of FIG. 7, the area securing unit 40 secures an area having the same capacity as the required data calculated by the search range determining unit 30 in the work memory 24.

  The extraction unit 50 includes a search start address acquisition unit 51, a data copy unit 52, an attention record setting unit 31, a type acquisition unit 33, a type determination unit 34, and a tail record determination unit 38. As shown in FIG. 7, the extraction unit 50 searches the range determined by the search range determination unit 30 out of the entire range of the ring buffer 23 and extracts the required data. Copy to the area of the work memory 24 secured by the securing unit 40.

  Note that the attention record setting unit 31, the type acquisition unit 33, the type determination unit 34, and the end record determination unit 38 of the extraction unit 50 are the target record setting unit 31, the type acquisition unit 33, and the type determination unit 34 of the search range determination unit. Since the configuration is the same as that of the end record determination unit 38, the same reference numerals are given and description thereof is omitted.

  The search start address acquisition unit 51 acquires a search start address temporarily stored in a required work area of the work memory 24 or the like.

  The data copy unit 52 copies the data element determined by the type determination unit 34 as a type satisfying a predetermined condition to the work memory 24.

  Next, an example of the operation of the mobile phone 10 according to the present embodiment will be described.

  FIG. 8 shows a procedure when the control unit 26 of the mobile phone 10 executes a process of securing only an area having the same capacity as the required data capacity in the work memory 24 and extracting the required data from the ring buffer 23. It is a flowchart to show. In FIG. 8, reference numerals with numbers added to S indicate steps in the flowchart. In the following procedure, an example has been described in which data necessary for program execution is temporarily stored in a required work area of the work memory 24 as appropriate. For example, a CPU cache memory or a storage unit 25 may be used.

  This procedure starts when the information of the head address is set to an auto variable and is made available by the control unit 26.

  In the following description, the ring buffer 23 stores the log of the mobile phone 10, a serious error occurs in the system, the system is automatically reset, and the control unit 26 causes a serious error in the system. An example of a case where a start is detected by detecting this.

  For example, the control unit 26 receives a predetermined event signal from the system or detects that the latest log element stored in the ring buffer 23 at the time of activation is a log element of a high importance type. Thus, it is possible to detect that a serious error has occurred in the system.

  When the log of the mobile phone 10 is stored in the ring buffer 23, the predetermined event signal may include a signal indicating that a trouble has occurred in the system. When a problem occurs in the system, the system status changes from the normal startup status to a status in which user operations are not accepted (so-called freeze status), or to the restart status automatically or by user instruction. Often. Therefore, when the log of the mobile phone 10 is stored in the ring buffer 23, the control unit 26 may assign in advance an event signal indicating that automatic restart (reset) is started as a predetermined event signal, for example. .

  First, in step S1, the search range determination unit 30 sets a search range for the ring buffer 23 so that the accumulated data length of data elements satisfying a predetermined data type condition included in the search range is equal to or less than a predetermined capacity. Determine (refer to the range surrounded by the thick line on the left in FIG. 7). Further, the search range determination unit 30 calculates the capacity of required data (a data element group composed of data elements satisfying a predetermined data type condition included in the search range).

  More specifically, the search range determination unit 30 extracts, for example, log elements that are types of importance level 4 or higher, and the integrated data length of log elements included in the search range is equal to or less than a predetermined capacity. The search range is determined so as to be excluded from the range in order from the oldest log element. Further, the search range determination unit 30 calculates the capacity of a required log (a log element group composed of log elements of a type of level 4 or higher included in the search range).

  Next, in step S2, the area securing unit 40 secures an area having the same capacity as the required data (log) capacity in the work memory 24 (see the right in FIG. 7).

Next, in step S3, the extraction unit 50 searches the range determined by the search range determination unit 30 out of the entire range of the ring buffer 23, extracts the required data (log), and extracts the extracted required log Is copied to the area of the working memory 24 secured by the area securing unit 40. By the above procedure, only the area having the same capacity as the capacity of the required data (log) is secured in the working memory 24 and the necessary data is stored from the ring buffer 23. Data (log) can be extracted.

  Next, a procedure for determining the search range for the ring buffer 23 will be described so that the accumulated data length of data elements satisfying a predetermined data type condition included in the search range is equal to or less than a predetermined capacity.

  FIG. 9 is a subroutine flowchart showing a search range determination process executed by the search range determination unit 30 in step S1 of FIG. In FIG. 9, the code | symbol which attached | subjected the number to S shows each step of a flowchart.

  First, in step S11, the record-of-interest setting unit 31 sets the head record as the record of interest by temporarily storing the head address in a required work area of the work memory 24 or the like. As a result, the control unit 26 first accesses the first record.

  Next, in step S12, the search start address setting unit 32 sets the head address as the search start address. At this time, the search range is only the first record.

  Next, in step S <b> 13, the type acquisition unit 33 accesses the attention address temporarily stored in a required work area of the work memory 24 and acquires information on the data type of the attention record.

  Next, in step S <b> 14, the type determination unit 34 determines whether the data type acquired by the type acquisition unit 33 is a type that satisfies a predetermined condition. If the type satisfies the predetermined condition, the process proceeds to step S15. On the other hand, if the type does not satisfy the predetermined condition, the process proceeds to step S18.

  Next, in step S15, the data length acquisition unit 35 acquires the data length of the data element stored in the attention record that is the currently accessed record from the header of the attention record.

  Next, in step S <b> 16, the integrated data length calculation unit 36 changes the data length acquired by the data length acquisition unit 35 to the integrated value of the data length temporarily stored in the required work area of the work memory 24. By integrating, the integrated data length of the data element satisfying a predetermined data type condition is calculated. When this step S16 is executed for the first time, it is noted that nothing is stored in the required work area of the work memory 24.

  Next, in step S17, the data capacity determination unit 37 determines whether or not the accumulated data length is equal to or less than a predetermined capacity. If it is less than the predetermined capacity, the process proceeds to step S18. On the other hand, if it is larger than the predetermined capacity, the process proceeds to step S20.

  Next, in step S18, the tail record determination unit 38 determines whether or not the next record of the record of interest currently being accessed is the top record or an empty record. If the next record after the record of interest is the first record or the empty record, that is, if the currently accessed record is the last record, the series of procedures is completed, and the process proceeds to step S2 in FIG. On the other hand, if the currently accessed record is not the last record, the process proceeds to step S19.

  Next, in step S19, the record-of-interest setting unit 31 newly sets a record next to the record of interest currently being accessed as the record of interest, and returns to step S13.

  On the other hand, if it is determined in step S17 that the accumulated data length is greater than the predetermined capacity, in step S20, the control unit 26 resets the search start address so that the accumulated data length is equal to or less than the predetermined capacity. Execute processing to adjust the search range.

  With the above procedure, the search range can be determined for the ring buffer 23 so that the integrated data length of the data elements satisfying the predetermined data type condition is equal to or less than the predetermined capacity.

  Next, a procedure for adjusting the search range by resetting the search start address so that the accumulated data length is equal to or less than a predetermined capacity will be described.

  FIG. 10 is a subroutine flowchart showing the procedure of the search range adjustment process executed by the search range determination unit 30 in step S20 of FIG. In FIG. 10, reference numerals with numbers added to S indicate steps in the flowchart.

  FIG. 11 is an explanatory diagram showing an example of how the search range is adjusted by resetting the search start address. FIG. 11A illustrates an example of a search range when the search start address is the start address, and FIG. 11B illustrates the search start address changed to the start address of the next record after the start record. An explanatory view showing an example of the appearance is shown. Further, FIG. 11C shows that the search start address is set to this record so as to exclude the record storing the data element of the type satisfying the oldest predetermined condition from the search range so that the accumulated data length is equal to or less than the predetermined capacity. It is explanatory drawing which shows an example of a mode changed to the start address of the next record of.

  The main point of the procedure shown in FIG. 10 is that the search start address is reset so that the accumulated data length that exceeds the predetermined capacity is equal to or less than the predetermined capacity, so that the oldest data elements are sequentially out of the search range. There is.

  In step S201, the type acquisition unit 33 acquires information on the search start address temporarily stored in a required work area of the work memory 24, accesses the search start address, and stores the data stored in the search start record. Get element type information. When this step S201 is executed for the first time, the search start address is the same as the head address (see FIG. 11A).

  Next, in step S <b> 202, the type determination unit 34 determines whether the data type acquired by the type acquisition unit 33 is a type that satisfies a predetermined condition. If the type satisfies the predetermined condition (see FIG. 11B), the process proceeds to step S203. On the other hand, if the type does not satisfy the predetermined condition, the process proceeds to step S206.

  Next, in step S203, the data length acquisition unit 35 acquires the data length of the data element stored in the search start record that is the currently accessed record from the header of the search start record.

  Next, in step S <b> 204, the integrated data length calculation unit 36 calculates the data length acquired by the data length acquisition unit 35 from the integrated value of the data length temporarily stored in the required work area of the work memory 24. Subtract.

  Next, in step S205, the data capacity determination unit 37 determines whether or not the accumulated data length is equal to or less than a predetermined capacity. If larger than the predetermined capacity, the process proceeds to step S206. On the other hand, if it is less than the predetermined capacity, the process proceeds to step S207.

  Next, in step S206, the search start address setting unit 32 sets the start address of the record next to the current search start record as a new search start address, and returns to step S201.

  On the other hand, if it is determined in step S205 that the accumulated data length is equal to or smaller than the predetermined capacity, in step S207, the search start address setting unit 32 sets the start address of the record next to the current search start record as a new search start address. Setting is made (see FIG. 11C).

  Next, in step S208, the type acquisition unit 33 acquires information on the type of the data element stored in the new search start record.

  Next, in step S209, the type determination unit 34 determines whether or not the data type acquired by the type acquisition unit 33 is a type that satisfies a predetermined condition. If the type satisfies the predetermined condition, the series of procedures is terminated, and the process proceeds to step S18 in FIG. On the other hand, if the type does not satisfy the predetermined condition, the process returns to step S207.

  By the above procedure, the search range can be adjusted by resetting the search start address so that the accumulated data length is equal to or less than the predetermined capacity.

  Note that the procedures in steps S208 and S209 are procedures for making the start record of the search range a record storing data elements that satisfy a predetermined condition, but may be omitted. If omitted, the time required for not performing steps S208 and S209 can be saved, while the search range becomes wider, and the time required for the procedure shown in FIG. 12 increases.

  In the description of the procedures in FIGS. 9 and 10, the example in which the end record of the search range (the latest record in the search range) is the end record has been described. However, the end record of the search range satisfies the predetermined condition. A record storing data elements may be used. In this case, the address of the latest record that stores data elements that satisfy the predetermined condition may be stored in a required work area of the work memory 24 or the like. More specifically, if the step of “overwrite and store the address of the record of interest in a required area of the storage medium” is executed between YES and step S17 in step S14 in FIG. 9, the procedure shown in FIG. 9 is completed. At the same time, the address of the end record of the search range is stored in the required area of the storage medium.

  FIG. 12 illustrates the range determined by the search range determination unit 30 out of the entire range of the ring buffer 23, which is executed by the extraction unit 50 in step S3 of FIG. 8, and extracts necessary data (log). 10 is a subroutine flowchart showing a procedure for copying the extracted required log to the area of the work memory 24 secured by the area securing unit 40. In FIG. 12, the reference numerals with numbers added to S indicate the steps in the flowchart.

  In step S <b> 31, the search start address acquisition unit 51 acquires a search start address temporarily stored in a required work area of the work memory 24.

  Next, in step S <b> 32, the record-of-interest setting unit 31 sets the first record as the record of interest by temporarily storing the search start address in a required work area of the work memory 24. As a result, the control unit 26 first accesses the search start address.

  Next, in step S33, the type acquisition unit 33 accesses an attention address temporarily stored in a required work area of the work memory 24, and acquires data type information of the attention record.

  Next, in step S34, the type determination unit 34 determines whether the data type acquired by the type acquisition unit 33 is a type that satisfies a predetermined condition. If the type satisfies the predetermined condition, the process proceeds to step S35. On the other hand, if the type does not satisfy the predetermined condition, the process proceeds to step S36.

  Next, in step S <b> 35, the data copy unit 52 copies the data element of the record of interest to the work memory 24.

  Next, in step S36, the tail record determination unit 38 determines whether or not the next record of the record of interest currently being accessed is the top record or an empty record. If the next record after the record of interest is the first record or an empty record, that is, if the currently accessed record is the last record, the series of procedures is completed. On the other hand, if the currently accessed record is not the last record, the process proceeds to step S37.

  When the end record of the search range determined by the search range determination unit 30 is not a tail record but a record storing a data element satisfying a predetermined condition, the latest record (search for storing the data element satisfying the predetermined condition) The address of the range end record) is stored in a required work area of the work memory 24 or the like. In this case, in step S36, the tail record determination unit 38 determines whether the attention record currently being accessed is the end record of the search range.

  When the cellular phone 10 according to the present embodiment extracts a predetermined amount of data satisfying a required condition from various data stored in the ring buffer 23, the cellular phone 10 allocates an occupied area of the work memory 24 to a predetermined area. Can fit in capacity. In general, mobile terminals such as the mobile phone 10 often have a small capacity of the work memory 24. The cellular phone 10 according to the present embodiment is very convenient because it eliminates the use of the useless work memory 24 when extracting the data in the ring buffer 23.

  Further, according to the mobile phone 10 according to the present embodiment, when a serious error occurs in the system and the system is automatically reset, log elements satisfying a predetermined type (high importance) are updated to the latest. Only a predetermined volume or less can be extracted from the object. At this time, the work memory 24 reserved for the extraction process is only an area having the same capacity as the required log. For this reason, the work memory 24 can be sufficiently concentrated on the starting process as compared with the conventional technique. Note that the required log copied to the work memory 24 may be transmitted to an external log management device or the like via the network when the user is not operating after the system is started.

  Note that the present invention is not limited to the above-described embodiment as it is, and can be embodied by modifying the constituent elements without departing from the scope of the invention in the implementation stage. In addition, various inventions can be formed by appropriately combining a plurality of components disclosed in the embodiment. For example, you may delete some components from all the components shown by the said embodiment.

  For example, in the above embodiment, the procedure (FIG. 9) for determining the search range so as to fit within the predetermined capacity has been described. However, when there is no particularly strict upper limit of the capacity, such as when logs are not transferred over the network, An area having the same capacity as the capacity of all data elements satisfying the above condition may be secured in the work memory 24. Even in this case, waste of the work memory 24 can be sufficiently reduced as compared with the conventional technique.

  When the search start address and the start address of the end record of the search range are data elements that satisfy a predetermined condition, data elements that satisfy the predetermined condition are extracted in addition to the examples described in the above embodiment. Each time, that is, a step of “storing the data length and start address of the record of interest in the storage medium” somewhere between YES and S17 of step S14 in FIG. The step of “deleting information (data length and start address) of the oldest record in the storage medium storing the data length and start address” may be executed. In this case, when the series of steps in FIG. 9 is completed, the start address of the oldest record in this storage medium is the search start address, and the start address of the newest record is the start address of the end record in the search range. ing.

  Further, the present invention can be applied to various information processing apparatuses other than the mobile phone 10 described in the present embodiment, and in particular, a PDA (Personal Digital Assistant), a portable game machine, a portable music player. It can be applied to a portable terminal such as a portable video player.

  Further, in the embodiment of the present invention, each step of the flowchart shows an example of processing that is performed in time series in the order described. The process to be executed is also included.

DESCRIPTION OF SYMBOLS 10 Mobile telephone 11 1st housing | casing 12 2nd housing | casing 13 Connection part 14 Operation part 15 Speaker 16 Display part 17 Microphone 21 Antenna 22 Transmission / reception part 23 Ring buffer 24 Work memory 25 Storage part 26 Control part 30 Search range determination part 31 attention record setting unit 32 search start address setting unit 33 type acquisition unit 34 type determination unit 35 data length acquisition unit 36 integrated data length calculation unit 37 data capacity determination unit 38 tail record determination unit 40 area reservation unit 50 extraction unit 51 search start Address acquisition unit 52 Data copy unit

Claims (7)

A ring buffer composed of a plurality of records storing data elements;
A search range determination unit that determines a range including the required data configured by the data element satisfying a predetermined data type condition as a search range for the ring buffer, and calculates a capacity of the required data;
An area securing unit that secures an area of the same capacity as the required data capacity calculated by the search range determining unit;
The working memory in which the required data is extracted by searching the range determined by the search range determination unit out of the entire range of the ring buffer, and the extracted required data is secured by the area securing unit. An extractor to be copied to the area of
A portable terminal comprising: The required data, among all the data elements of the previous SL ring buffer is constituted by the predetermined data type satisfying the data element,
If the capacity of the required data is larger than a predetermined capacity , the predetermined data type condition that is chronologically close to the first record that is a record that stores the oldest data element is less than the predetermined capacity. the data elements Ru is excluded from the required data in order,
The mobile terminal according to claim 1. The search range determination unit
The search start address that is the start address of the search range is set to the start address that is the start address of the first record that is the record that stores the oldest data element, and the newest data element from the data element that is stored in the first record The data length of the data element that satisfies the predetermined data type condition is sequentially accumulated up to the end record that is a record that stores the data element, and when the accumulated data length becomes larger than the predetermined capacity, the accumulated data length The start address of the search range is excluded from the search range in order from the record that stores the data element that satisfies the predetermined data type condition that is close to the first record in time series so that is less than the predetermined capacity. Reset
The extraction unit includes:
The data element satisfying the predetermined data type condition is extracted in a range from the search range start address set by the search range determination unit to the end record in the ring buffer, and the extracted data element is Sequentially copying to the area of the working memory secured by the area securing unit;
The mobile terminal according to claim 2 . The area securing unit is
An area of the same capacity as the data length equal to or less than the predetermined capacity accumulated by the search range determination unit is secured in the working memory;
The portable terminal according to claim 3. The data element consists of a log output by the system,
The portable terminal according to any one of claims 1 to 4. When transitioning to a given system state,
The search range determining unit is configured to determine the range that contains the required data is configured for the ring buffer by the previous SL data elements to automatically satisfy a predetermined data type condition, the required data To calculate the capacity of
The area securing unit secures an area of the same capacity as the required data capacity in a working memory;
The extraction unit searches the range determined by the search range determination unit in the ring buffer to extract the required data, and the extracted required data is secured by the area securing unit. Copy to working memory area,
The mobile terminal according to claim 5. The predetermined system state is:
The system has been restarted due to an abnormality in the system.
The mobile terminal according to claim 6.

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