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| -rw-r--r-- | implement.h | 4 | ||||
| -rw-r--r-- | ptw32_semwait.c | 115 |
2 files changed, 119 insertions, 0 deletions
diff --git a/implement.h b/implement.h index b15f26e..081a670 100644 --- a/implement.h +++ b/implement.h @@ -38,6 +38,10 @@ #ifndef _IMPLEMENT_H #define _IMPLEMENT_H +#ifndef _WIN32_WINNT +# define _WIN32_WINNT 0x400 +#endif + #include <windows.h> /* * note: ETIMEDOUT is correctly defined in winsock.h diff --git a/ptw32_semwait.c b/ptw32_semwait.c new file mode 100644 index 0000000..38f31f5 --- /dev/null +++ b/ptw32_semwait.c @@ -0,0 +1,115 @@ +/* + * ptw32_semwait.c + * + * Description: + * This translation unit implements mutual exclusion (mutex) primitives. + * + * -------------------------------------------------------------------------- + * + * Pthreads-win32 - POSIX Threads Library for Win32 + * Copyright(C) 1998 John E. Bossom + * Copyright(C) 1999,2003 Pthreads-win32 contributors + * + * Contact Email: rpj@callisto.canberra.edu.au + * + * The current list of contributors is contained + * in the file CONTRIBUTORS included with the source + * code distribution. The list can also be seen at the + * following World Wide Web location: + * http://sources.redhat.com/pthreads-win32/contributors.html + * + * This library is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation; either + * version 2 of the License, or (at your option) any later version. + * + * This library is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with this library in the file COPYING.LIB; + * if not, write to the Free Software Foundation, Inc., + * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA + */ + +#ifndef _UWIN +//# include <process.h> +#endif +#include "pthread.h" +#include "implement.h" + + +INLINE int +ptw32_semwait (sem_t * sem) + /* + * ------------------------------------------------------ + * DESCRIPTION + * This function waits on a POSIX semaphore. If the + * semaphore value is greater than zero, it decreases + * its value by one. If the semaphore value is zero, then + * the calling thread (or process) is blocked until it can + * successfully decrease the value. + * + * Unlike sem_wait(), this routine is non-cancelable. + * + * RESULTS + * 0 successfully decreased semaphore, + * -1 failed, error in errno. + * ERRNO + * EINVAL 'sem' is not a valid semaphore, + * ENOSYS semaphores are not supported, + * EINTR the function was interrupted by a signal, + * EDEADLK a deadlock condition was detected. + * + * ------------------------------------------------------ + */ +{ + int result = 0; + + DWORD status; + + if (sem == NULL) + { + result = EINVAL; + } + else + { + +#ifdef NEED_SEM + + status = WaitForSingleObject ((*sem)->event, INFINITE); + +#else /* NEED_SEM */ + + status = WaitForSingleObject ((*sem)->sem, INFINITE); + +#endif + + if (status == WAIT_OBJECT_0) + { + +#ifdef NEED_SEM + + ptw32_decrease_semaphore (sem); + +#endif /* NEED_SEM */ + + return 0; + } + else + { + result = EINVAL; + } + } + + if (result != 0) + { + errno = result; + return -1; + } + + return 0; + +} /* ptw32_semwait */ |