author | jjkang |
Fri, 25 Jun 2010 19:56:45 +0800 | |
changeset 604 | b33dd54aaa52 |
parent 0 | 044383f39525 |
child 3 | e1eecf4d390d |
permissions | -rw-r--r-- |
0
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/* |
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* Copyright (c) 2009 Nokia Corporation and/or its subsidiary(-ies). |
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* All rights reserved. |
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* This component and the accompanying materials are made available |
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* under the terms of the License "Eclipse Public License v1.0" |
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* which accompanies this distribution, and is available |
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* at the URL "http://www.eclipse.org/legal/epl-v10.html". |
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* |
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* Initial Contributors: |
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* Nokia Corporation - initial contribution. |
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* |
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* Contributors: |
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* |
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* Description: |
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* |
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*/ |
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|
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|
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|
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|
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#include "sema.h" |
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|
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// OS specific headers |
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#ifdef WIN32 |
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#include <windows.h> |
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#include <tlhelp32.h> |
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#else |
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#include <semaphore.h> |
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#include <sys/types.h> |
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#include <signal.h> |
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#include <fcntl.h> |
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#include <time.h> |
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#endif |
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|
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#include <unistd.h> |
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|
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void sema_create(sbs_semaphore *s) |
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{ |
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#ifdef WIN32 |
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s->handle = CreateSemaphore(NULL, 1, 1, s->name); |
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if (s->handle) |
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CloseHandle(s->handle); |
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else |
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error("unable to create semaphore %s", s->name); |
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#else |
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s->handle = sem_open(s->name, O_CREAT | O_EXCL, 0644, 1); |
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|
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if (s->handle == SEM_FAILED) |
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{ |
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sem_close(s->handle); |
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error("unable to create semaphore %s", s->name); |
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} |
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sem_close(s->handle); |
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#endif |
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} |
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|
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void sema_destroy(sbs_semaphore *s) |
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{ |
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#ifdef WIN32 |
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/* can't destroy a windows semaphore... */ |
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#else |
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if (sem_unlink(s->name) != 0) |
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error("unable to unlink semaphore", s->name); |
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#endif |
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} |
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|
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int sema_wait(sbs_semaphore *s) |
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{ |
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/* try and open the semaphore now */ |
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#ifdef WIN32 |
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s->handle = CreateSemaphore(NULL, 1, 1, s->name); |
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if (!s->handle) |
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{ |
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error("unable to open semaphore %s", s->name); |
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return -2; |
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} |
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#else |
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struct timespec tmout; |
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|
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s->handle = sem_open(s->name, 0); |
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|
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if (s->handle == SEM_FAILED) |
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{ |
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sem_close(s->handle); |
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error("unable to open semaphore %s\n", s->name); |
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return -2; |
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} |
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#endif |
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|
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/* wait for the semaphore to be free [timeout if it takes too long] */ |
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int timedOutFlag = 0; |
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int semcount = 0; |
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#ifdef WIN32 |
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timedOutFlag = (WaitForSingleObject(s->handle, s->timeout) != WAIT_OBJECT_0); |
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#else |
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|
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sem_getvalue(s->handle, &semcount); |
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debug("sema: count before wait: %d\n", semcount); |
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debug("sema: timeout: %d\n", s->timeout); |
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|
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if (clock_gettime(CLOCK_REALTIME, &tmout) == -1) |
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{ |
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error("sema: clock_gettime failed - can't do timed wait"); |
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return -1; |
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} |
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|
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tmout.tv_sec += (s->timeout / 1000); |
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tmout.tv_nsec += (s->timeout % 1000) * 1000; |
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timedOutFlag = sem_timedwait(s->handle, &tmout); |
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/* roughly speaking the return value indicates timeouts. It also indicated |
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* signals. We are glossing over this for the moment since it isn't really |
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* interesting in this application |
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* */ |
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#endif |
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|
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return timedOutFlag; |
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} |
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|
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|
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void sema_release(sbs_semaphore *s) |
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{ |
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/* release the semaphore */ |
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#ifdef WIN32 |
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ReleaseSemaphore(s->handle, 1, NULL); |
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#else |
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sem_post(s->handle); |
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#endif |
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|
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/* clean up */ |
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#ifdef WIN32 |
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CloseHandle(s->handle); |
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#else |
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sem_close(s->handle); |
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#endif |
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} |