| 1 | /* $Id: vmutex.cpp,v 1.9 2000-03-23 19:23:47 sandervl Exp $ */
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| 2 |
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| 3 | /*
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| 4 | * Mutex class
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| 5 | *
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| 6 | * Copyright 1998-2000 Sander van Leeuwen (sandervl@xs4all.nl)
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| 7 | *
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| 8 | *
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| 9 | * NOTE: When creating a shared mutex object, you must call the ctor, enter &
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| 10 | * leave with a 2nd parameter (HMTX *). This mutex handle must be located
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| 11 | * in the local data segment of the dll.
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| 12 | * This enables other processes than the one that created the mutex object
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| 13 | * to access it
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| 14 | *
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| 15 | * Project Odin Software License can be found in LICENSE.TXT
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| 16 | *
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| 17 | */
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| 18 | #define INCL_DOSSEMAPHORES
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| 19 | #define INCL_DOSERRORS
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| 20 | #include <os2wrap.h> //Odin32 OS/2 api wrappers
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| 21 | #include <vmutex.h>
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| 22 | #include <win32type.h>
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| 23 | #include <misc.h>
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| 24 |
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| 25 | #define DBG_LOCALLOG DBG_vmutex
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| 26 | #include "dbglocal.h"
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| 27 |
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| 28 | /******************************************************************************/
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| 29 | /******************************************************************************/
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| 30 | VMutex::VMutex(int fShared, HMTX *phMutex) : waiting(0)
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| 31 | {
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| 32 | APIRET rc;
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| 33 |
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| 34 | this->fShared = fShared;
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| 35 | rc = DosCreateMutexSem(NULL, &sem_handle, (fShared == VMUTEX_SHARED) ? DC_SEM_SHARED : 0, FALSE);
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| 36 | if(rc != 0) {
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| 37 | dprintf(("Error creating mutex %X\n", rc));
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| 38 | sem_handle = 0;
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| 39 | }
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| 40 | if(fShared) {
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| 41 | *phMutex = sem_handle;
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| 42 | }
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| 43 | }
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| 44 | /******************************************************************************/
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| 45 | /******************************************************************************/
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| 46 | VMutex::~VMutex()
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| 47 | {
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| 48 | int i;
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| 49 |
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| 50 | if(sem_handle) {
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| 51 | if(fShared != VMUTEX_SHARED) {
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| 52 | for(i=0;i<waiting;i++) {
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| 53 | DosReleaseMutexSem(sem_handle);
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| 54 | }
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| 55 | }
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| 56 | DosCloseMutexSem(sem_handle);
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| 57 | }
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| 58 | }
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| 59 | /******************************************************************************/
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| 60 | /******************************************************************************/
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| 61 | void VMutex::enter(ULONG timeout, HMTX *phMutex)
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| 62 | {
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| 63 | APIRET rc;
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| 64 |
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| 65 | if(fShared == VMUTEX_SHARED && phMutex == NULL) {
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| 66 | DebugInt3();
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| 67 | return;
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| 68 | }
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| 69 | if(sem_handle) {
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| 70 | if(fShared == VMUTEX_SHARED && *phMutex == 0) {
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| 71 | //must open the shared semaphore first (other process created it)
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| 72 | *phMutex = sem_handle;
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| 73 | rc = DosOpenMutexSem(NULL, phMutex);
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| 74 | if(rc) {
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| 75 | DebugInt3();
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| 76 | }
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| 77 | }
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| 78 | waiting++;
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| 79 | rc = DosRequestMutexSem((fShared == VMUTEX_SHARED) ? *phMutex : sem_handle, timeout);
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| 80 | waiting--;
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| 81 | }
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| 82 | }
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| 83 | /******************************************************************************/
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| 84 | /******************************************************************************/
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| 85 | void VMutex::leave(HMTX *phMutex)
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| 86 | {
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| 87 | if((fShared == VMUTEX_SHARED && phMutex == NULL) ||
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| 88 | (fShared == VMUTEX_SHARED && *phMutex == 0)) {
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| 89 | DebugInt3();
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| 90 | //should always call enter first...
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| 91 | return;
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| 92 | }
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| 93 | DosReleaseMutexSem((fShared == VMUTEX_SHARED) ? *phMutex : sem_handle);
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| 94 | }
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| 95 | /******************************************************************************/
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| 96 | /******************************************************************************/
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| 97 |
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