nsprpub/pr/src/misc/pripcsem.c

   1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
   2 /* This Source Code Form is subject to the terms of the Mozilla Public
   3  * License, v. 2.0. If a copy of the MPL was not distributed with this
   4  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   5
   6 /*
   7  * File: pripcsem.c
   8  *
   9  * Description: implements the named semaphores API in prsemipc.h
  10  * for classic NSPR.  If _PR_HAVE_NAMED_SEMAPHORES is not defined,
  11  * the named semaphore functions all fail with the error code
  12  * PR_NOT_IMPLEMENTED_ERROR.
  13  */
  14
  15 #include "primpl.h"
  16
  17 #ifdef _PR_PTHREADS
  18
  19 #  error "This file should not be compiled for the pthreads version"
  20
  21 #else
  22
  23 #  ifndef _PR_HAVE_NAMED_SEMAPHORES
  24
  25 PRSem* _PR_MD_OPEN_SEMAPHORE(const char* osname, PRIntn flags, PRIntn mode,
  26                              PRUintn value) {
  27   PR_SetError(PR_NOT_IMPLEMENTED_ERROR, 0);
  28   return NULL;
  29 }
  30
  31 PRStatus _PR_MD_WAIT_SEMAPHORE(PRSem* sem) {
  32   PR_SetError(PR_NOT_IMPLEMENTED_ERROR, 0);
  33   return PR_FAILURE;
  34 }
  35
  36 PRStatus _PR_MD_POST_SEMAPHORE(PRSem* sem) {
  37   PR_SetError(PR_NOT_IMPLEMENTED_ERROR, 0);
  38   return PR_FAILURE;
  39 }
  40
  41 PRStatus _PR_MD_CLOSE_SEMAPHORE(PRSem* sem) {
  42   PR_SetError(PR_NOT_IMPLEMENTED_ERROR, 0);
  43   return PR_FAILURE;
  44 }
  45
  46 PRStatus _PR_MD_DELETE_SEMAPHORE(const char* osname) {
  47   PR_SetError(PR_NOT_IMPLEMENTED_ERROR, 0);
  48   return PR_FAILURE;
  49 }
  50
  51 #  endif /* !_PR_HAVE_NAMED_SEMAPHORES */
  52
  53 PR_IMPLEMENT(PRSem*)
  54 PR_OpenSemaphore(const char* name, PRIntn flags, PRIntn mode, PRUintn value) {
  55   char osname[PR_IPC_NAME_SIZE];
  56
  57   if (!_pr_initialized) {
  58     _PR_ImplicitInitialization();
  59   }
  60   if (_PR_MakeNativeIPCName(name, osname, sizeof(osname), _PRIPCSem) ==
  61       PR_FAILURE) {
  62     return NULL;
  63   }
  64   return _PR_MD_OPEN_SEMAPHORE(osname, flags, mode, value);
  65 }
  66
  67 PR_IMPLEMENT(PRStatus) PR_WaitSemaphore(PRSem* sem) {
  68   return _PR_MD_WAIT_SEMAPHORE(sem);
  69 }
  70
  71 PR_IMPLEMENT(PRStatus) PR_PostSemaphore(PRSem* sem) {
  72   return _PR_MD_POST_SEMAPHORE(sem);
  73 }
  74
  75 PR_IMPLEMENT(PRStatus) PR_CloseSemaphore(PRSem* sem) {
  76   return _PR_MD_CLOSE_SEMAPHORE(sem);
  77 }
  78
  79 PR_IMPLEMENT(PRStatus) PR_DeleteSemaphore(const char* name) {
  80   char osname[PR_IPC_NAME_SIZE];
  81
  82   if (!_pr_initialized) {
  83     _PR_ImplicitInitialization();
  84   }
  85   if (_PR_MakeNativeIPCName(name, osname, sizeof(osname), _PRIPCSem) ==
  86       PR_FAILURE) {
  87     return PR_FAILURE;
  88   }
  89   return _PR_MD_DELETE_SEMAPHORE(osname);
  90 }
  91
  92 #endif /* _PR_PTHREADS */