| lh | 9ed821d | 2023-04-07 01:36:19 -0700 | [diff] [blame^] | 1 | /* Copyright (C) 2002, 2003 Free Software Foundation, Inc. |
| 2 | This file is part of the GNU C Library. |
| 3 | |
| 4 | The GNU C Library is free software; you can redistribute it and/or |
| 5 | modify it under the terms of the GNU Lesser General Public |
| 6 | License as published by the Free Software Foundation; either |
| 7 | version 2.1 of the License, or (at your option) any later version. |
| 8 | |
| 9 | The GNU C Library is distributed in the hope that it will be useful, |
| 10 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 12 | Lesser General Public License for more details. |
| 13 | |
| 14 | You should have received a copy of the GNU Lesser General Public |
| 15 | License along with the GNU C Library; if not, write to the Free |
| 16 | Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA |
| 17 | 02111-1307 USA. */ |
| 18 | |
| 19 | #ifndef _SEMAPHORE_H |
| 20 | #define _SEMAPHORE_H 1 |
| 21 | |
| 22 | #include <features.h> |
| 23 | #include <sys/types.h> |
| 24 | #ifdef __USE_XOPEN2K |
| 25 | # define __need_timespec |
| 26 | # include <time.h> |
| 27 | #endif |
| 28 | |
| 29 | /* Get the definition for sem_t. */ |
| 30 | #include <bits/semaphore.h> |
| 31 | |
| 32 | |
| 33 | __BEGIN_DECLS |
| 34 | |
| 35 | /* Initialize semaphore object SEM to VALUE. If PSHARED then share it |
| 36 | with other processes. */ |
| 37 | extern int sem_init (sem_t *__sem, int __pshared, unsigned int __value) |
| 38 | __THROW; |
| 39 | /* Free resources associated with semaphore object SEM. */ |
| 40 | extern int sem_destroy (sem_t *__sem) __THROW; |
| 41 | |
| 42 | /* Open a named semaphore NAME with open flags OFLAG. */ |
| 43 | extern sem_t *sem_open (__const char *__name, int __oflag, ...) __THROW; |
| 44 | |
| 45 | /* Close descriptor for named semaphore SEM. */ |
| 46 | extern int sem_close (sem_t *__sem) __THROW; |
| 47 | |
| 48 | /* Remove named semaphore NAME. */ |
| 49 | extern int sem_unlink (__const char *__name) __THROW; |
| 50 | |
| 51 | /* Wait for SEM being posted. |
| 52 | |
| 53 | This function is a cancellation point and therefore not marked with |
| 54 | __THROW. */ |
| 55 | extern int sem_wait (sem_t *__sem); |
| 56 | |
| 57 | #ifdef __USE_XOPEN2K |
| 58 | /* Similar to `sem_wait' but wait only until ABSTIME. |
| 59 | |
| 60 | This function is a cancellation point and therefore not marked with |
| 61 | __THROW. */ |
| 62 | extern int sem_timedwait (sem_t *__restrict __sem, |
| 63 | __const struct timespec *__restrict __abstime); |
| 64 | #endif |
| 65 | |
| 66 | /* Test whether SEM is posted. */ |
| 67 | extern int sem_trywait (sem_t *__sem) __THROW; |
| 68 | |
| 69 | /* Post SEM. */ |
| 70 | extern int sem_post (sem_t *__sem) __THROW; |
| 71 | |
| 72 | /* Get current value of SEM and store it in *SVAL. */ |
| 73 | extern int sem_getvalue (sem_t *__restrict __sem, int *__restrict __sval) |
| 74 | __THROW; |
| 75 | |
| 76 | |
| 77 | __END_DECLS |
| 78 | |
| 79 | #endif /* semaphore.h */ |