CN1790270A - Java virtual machine implementation method supporting multi-process - Google Patents
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Abstract
The invention discloses a Java virtual machine realization method, which is characterized by the following: managing the integrated procedure in the Java virtual machine; switching the procedure dispatching; corresponding the procedure communication mechanism; controlling the internal memory to operate multiple Java procedures simultaneously; saving system resource; improving the procedure concurrent efficiency; reducing the dispatcher cost; fitting for inserted-type Java operation system.
Description
Technical field
The present invention relates to java applet design language and operation system technology, relate to java applet operation realization technology and scheduling handoff technique and process space distribution technique, particularly relate to the Java Virtual Machine method of supporting multi-process.
Background technology
Java language is the cross-platform object-oriented high-level programming language of being released by Sun Microsystems, just obtains more and more important position in every field at present, has become one of most important programming language.
The executable code of Java language is the Java bytecode (Byte Code) of unified standard after the compiling, as long as on a platform, Java Virtual Machine is arranged, so all Java executable codes can move under this Java Virtual Machine is supported, thereby Java has cross-platform good characteristic.
Under the present Java Virtual Machine environment, there is not the notion of multi-process.The thread that defines in the Java language comprises an internal memory entry point address, an exit point address and the code sequence that can carry out in proper order.But the important difference of process and thread is thread and can not carries out separately that it has to operate in the program process that is in active state, and therefore can define thread is the sequence code stream with concurrency of program inside.The meaning of multithreading is that a plurality of logical blocks of an application program can carry out concomitantly.But multithreading also do not mean that a plurality of consumer process and carrying out, and operating system is not come distributing independent system resource to each thread as process independently yet.Process can be created its subprocess, and subprocess has different executable codes and datarams space with parent process.And at a plurality of thread shared data of the process memory headroom that is used for representing application program, but keep each thread to have independently execution stack and program execution context.In present operating system, the multi-course concurrency operation is very general, and will realize that a plurality of java applets are concurrent, and then the execution of each java applet all needs an independent Java Virtual Machine to support.This mode does not have too big problem under normal conditions, because the Java executable code is explained by virtual machine and is carried out, from the angle of host operating system (promptly support Java Virtual Machine operation operating system), be exactly one with the Java Virtual Machine process of a Java executable code as input.All relevant issues of multi-process can be handled by the management of process mechanism of operating system.But under some special circumstances, under the environment that does not have host operating system,, then must be responsible for the work of management of process by virtual machine if support multi-course concurrency to carry out.
Summary of the invention
The object of the present invention is to provide a kind of Java Virtual Machine method for designing of supporting multi-process.
The technical scheme that the present invention solves its technical matters employing is as follows:
1, a kind of Java Virtual Machine implementation method of supporting multi-process:
1) process switching method
By the process scheduling device of java virtual machine replacement operating system, be responsible for the scheduling of each process:
I, by the process three kinds of states that are in operation: operation, ready, wait for, in Java Virtual Machine, set up three kinds of process queues: operation queue, ready queue, waiting list;
II, ready queue be height according to priority, adopts deque to realize, the dispatching method of each formation adopts round-robin scheduling;
2) each process communication method
I, carry out communication with signal
Signal is the incident of being transmitted to a process by identical or different process.Signal is used for to a process notice anomalous event;
II, carry out communication with message queue
Message is exactly in fact the sequence of some words or byte, and it is kept in the Java Virtual Machine, and process can be crossed a kind of identifier identification message.Message is transmitted between process by the method for message queue, and message queue is the lists of links of a message;
3) internal memory control method
Java Virtual Machine is each process creation memory headroom, guarantees that simultaneously the memory headroom of each process is isolated in logic mutually, and a process can not be visited the local variable of another process, and the memory headroom of a process comprises following components:
1. pile: the entity of all objects all is placed in the heap;
2. stack: each thread all has a stack;
3. method memory field: in store executable code;
Constant pool when 4. moving.The in store compilation phase is with regard to available all constants;
5. frame: each method call is corresponding to a frame of stack top, and this part distributes in stack;
6. local variable: distribute by frame;
7. operand stack: because the instruction set of Java Virtual Machine is the stack formula, so operand all must be placed in the stack operand stack that Here it is.Each frame is corresponding to an operand stack, and this part distributes in frame.
The present invention compares with background technology, and the useful effect that has is:
(1) saves system resource significantly.During each process initiation, no longer be each process that all will generate a Java Virtual Machine, but process joined in the process queue of virtual machine self to have only the process of a Java Virtual Machine in the operating system, save system resource significantly.
(2) the concurrent efficient of raising process.Switching between the process is directly carried out in Java Virtual Machine, and need not transfer to operating system scheduling again, has reduced the spending of scheduler, and the switch speed between each process is more efficient.
(3) support that multi-course concurrency is carried out under the no host operating system environment.Integrated process scheduling and communication means in the native system make the switching of each process and communication mutually no longer rely on operating system to finish, and under no host operating system environment, serve as the role of a micro-kernel, and it is concurrent to coordinate each process.
Description of drawings
Fig. 1 is the process status transition diagram;
Fig. 2 is an internal memory control synoptic diagram;
Fig. 3 is a process operation synoptic diagram.
Specific implementation method
1) process scheduling method
By the process scheduling device of java virtual machine replacement operating system, be responsible for the scheduling of each process:
I, by the process three kinds of states that are in operation: operation, ready, wait for, in Java Virtual Machine, set up three kinds of process queues: operation queue, ready queue, waiting list.
Running status: a process just is in running status when occupying processor;
Ready state: process such as wait take processor;
Waiting status: a process can not be carried out before some incident takes place, as disk operating;
Corresponding in Java Virtual Machine, set up three kinds of process queues: operation queue, ready queue, waiting list.Wherein, the process in the operation queue is in run mode, shares the CPU time sheet according to priority; Process in the ready queue is in ready attitude, waits for being placed into operation queue; The process of waiting list is in waiting status, waits for being waken up by signal or system event entering ready attitude.
These three kinds of states switch mutually in operating system, show in the system: after a process has obtained all resources, this process is entered the medium timeslice to be allocated of ready queue, in case acquisition timeslice, this process is just put into operation queue, also lack certain resource if process is removed cpu, this process is drained into waiting list; Be transferred to ready queue after process timeslice in the operation queue uses up,, then be transferred to waiting list if operation will be waited for certain incident during process; When resource satisfied, the process in the waiting list can be waken up by incident and signal and join in the ready queue.Conversion regime between each state is seen Fig. 1.
II, ready queue be height according to priority, adopts deque to realize, the dispatching method of each formation adopts round-robin scheduling.
Process is distinguished real-time process and common process on the whole, real-time process requires than higher system responses, the common process of face is less demanding to system responses, they between the two, real-time process should be moved prior to common process, so, the priority height of the common process of ratio that the priority of real-time process will be established, among the present invention, the ready queue of process adopts deque to realize, one is the higher real-time process formation of priority ratio, and one is the lower common process queue of priority ratio.
Java Virtual Machine is at first selected the process operation in the real-time queue, when being sky, real-time queue just selects the time-histories operation in the common process queue, and in each formation, decision by which process is moved, and adopts the round-robin scheduling method, and Java Virtual Machine produces a clock with certain gap periods ground and interrupts, when central broken hair is given birth to, the current process of moving is placed in the ready queue, selects the longest process operation of life period then from ready queue, and concrete steps are as follows:
1, to specify scheduling parameter when creating process, and the real-time priority and the trim values of process are set, trim values will be converted to the length of the timeslice of this task;
2, if this process is not waited for resource, then this process is joined in the ready queue.
3, the ready queue of scheduler program traversal is calculated the scheduling weights according to real-time priority, selects the highest task of weights to use cpu.
4, if the timeslice in the ready queue is 0, the timeslice of this task can be set then according to trim values, simultaneously this process is put into the end of ready queue.Repeating step 3.
5, current process initiatively withdraws from cpu owing to wait for resource, and then it adds in the waiting list.Repeating step 3.
2) each process communication method
I, carry out communication with signal
Signal is the incident of being transmitted to a process by identical or different process.Signal is used for to a process notice anomalous event.
Signal is the software simulation of hardware interrupts, when process is being carried out, almost all incident can take place at any time.This unpredictability means that signal is asynchronous.Not only signal can take place at any time, and the process of received signal can not have control yet when signal goes out.
Under many situations all signal can appear.Hardware anomalies is quoted as illegal internal memory, just can produce signal people.Software anomaly, as attempt to carry out write operation to a pipeline that does not read, also can produce a signal, the operation of terminal generation also can produce process in addition.
After process was received a signal, it can take one of following three kinds of measures to signal:
1., ignore this signal
2., catch this signal, this will cause carrying out one section special code that is called signal processor
3., allow to carry out the default action of signal
When causing the signal event to occur,, just produce a signal at certain process such as hardware anomalies.On the contrary, when process is taken measures to the signal that sends to it, just claim that this signal is sent.To be called signal unsettled producing signal and sending time interval between the signal.Sending signal can get clogged or be delayed.This signal is delayed always, up to be disengaged block or the process of receiving the deployment way of this signal is changed into ignore till, signal is disposed how response signal of the process that is meant.A process can be ignored signal, allow the operation of its acquiescence to take place, and perhaps handles this signal.A signal that gets clogged is also referred to as unsettled signal, and a signal set is represented multiple signal, and the signal mask of a process is that process is blocked the not signal set of transmissibility at present down.
II, carry out communication with message queue
Message is exactly in fact the sequence of some words or byte, and it is kept in the Java Virtual Machine, and process can be crossed a kind of identifier identification message.Message is transmitted between process by the method for message queue, and message queue is the lists of links of a message.When a message is added to message queue, this message can be added to the end of formation, but be different with general fifo queue, message in the message queue can be retrieved with some random order, can from formation, retrieve message to come out with the type of a message, from this respect, formation is similar in realization in conjunction with array.
To row, following operation is arranged at message:
1. create and open message queue
After creating the message queue success, set up a brand-new message queue, and the return messages queue identifier, message queue success back return messages queue identifier opened.
2. in formation, write message
When if message count reaches the maximal value of maximal value that single queue allows or total system in the formation, perhaps during Insufficient privilege, the transmission failure of message.When message sends successfully, message is written to the end of message queue.
3. read message in the formation
Can read message in the message queue according to condition, when reading successfully, message turns back to calling process, and the message in the deletion message queue.
4. delete message queue
With whole message queue deletion.
2. internal memory control
According to the Java Virtual Machine standard, the structure of its memory headroom specified as described below as shown in Figure 2 when a java applet was carried out:
1. pile.The entity of all objects all is placed in the heap.Among the Java to one to as if conduct interviews by reference, quote and can all in heap, create in fact but quote object pointed from allocation space in the stack.The object that Garbage Collection Mechanism is paid attention to is just piled.
2. stack.Each thread all has a stack, and is similar with the stack of C language, preserves the scene with stack during function call, and the local variable of function also all is an allocation space in stack.
3. method memory field: the method memory field also can carry out refuse collection in fact, but this is dispensable.The in store executable code in method memory field, Java Virtual Machine are explained then and are carried out just from reading command here.
Constant pool when 4. moving: the in store compilation phase, this part distributed in the method memory field with regard to available all constants.
5. frame: each method call is corresponding to a frame of stack top, and this part distributes in stack.
6. local variable: this part distributes in frame.
7. operand stack: because the instruction set of Java Virtual Machine is the stack formula, so operand all must be placed in the stack operand stack that Here it is.Each frame is corresponding to an operand stack, and this part distributes in frame.
Our Java Virtual Machine has all independently kept above-mentioned structure for each process, except heap.Because java applet does not allow the programmer directly to discharge the shared memory headroom of object, and Java does not have pointer, and the enforcement strong type checking, so program only limits to create object to the visit of heap and to the visit of native object, to other process to as if can't visit.So it is safe allowing all processes share a heap, and makes things convenient for refuse collection.
In order to support the concurrent execution of a plurality of processes, the Java Virtual Machine among the present invention can be each process creation memory headroom, guarantees that simultaneously the memory headroom of each process is isolated in logic mutually, and a process can not be visited the local variable of another process.But with the virtual memory difference of common operating system, refuse collection for convenience, the heap unified management that Java Virtual Machine is supported does not need all to establish a heap for each process.This has also embodied the advantage of supporting the multi-process Java Virtual Machine.If the corresponding Java Virtual Machine of each process, that is the unified management that impossible realize refuse collection.
Fig. 3 is the synoptic diagram of the whole service process of a process, and at first newly-built process is this course allocation internal memory, describes the internal memory control of seeing in the specific implementation method in detail, if the Memory Allocation failure, then this process finishes.Behind the storage allocation, process is dispatched, show as, this process is switched under ready, operation, three kinds of states of wait, the process switching method in the specific implementation method is seen in detailed description, and in addition, process is in operation and also will communicates, communication means is seen the process communication method in the specific implementation method, and finish process operation back.
Claims (1)
1, a kind of Java Virtual Machine implementation method of supporting multi-process is characterized in that:
1) process switching method
By the process scheduling device of java virtual machine replacement operating system, be responsible for the scheduling of each process:
I, by the process three kinds of states that are in operation: operation, ready, wait for, in Java Virtual Machine, set up three kinds of process queues: operation queue, ready queue, waiting list;
II, ready queue be height according to priority, adopts deque to realize, the dispatching method of each formation adopts round-robin scheduling;
2) each process communication method
I, carry out communication with signal
Signal is the incident of being transmitted to a process by identical or different process.Signal is used for to a process notice anomalous event;
II, carry out communication with message queue
Message is exactly in fact the sequence of some words or byte, and it is kept in the Java Virtual Machine, and process can be crossed a kind of identifier identification message.Message is transmitted between process by the method for message queue, and message queue is the lists of links of a message;
3) internal memory control method
Java Virtual Machine is each process creation memory headroom, guarantees that simultaneously the memory headroom of each process is isolated in logic mutually, and a process can not be visited the local variable of another process, and the memory headroom of a process comprises following components:
1. pile: the entity of all objects all is placed in the heap;
2. stack: each thread all has a stack;
3. method memory field: in store executable code;
Constant pool when 4. moving.The in store compilation phase is with regard to available all constants;
5. frame: each method call is corresponding to a frame of stack top, and this part distributes in stack;
6. local variable: distribute by frame;
7. operand stack: because the instruction set of Java Virtual Machine is the stack formula, so operand all must be placed in the stack operand stack that Here it is.Each frame is corresponding to an operand stack, and this part distributes in frame.
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