projects / thirdparty / glibc.git / blame
| Commit | Line | Data |
|---|---|---|
| b01fe5f7 | 1 | /* sem_trywait -- wait on a semaphore. SPARC version. |
| d4697bc9 | 2 | Copyright (C) 2003-2014 Free Software Foundation, Inc. |
| b01fe5f7 UD |
3 | This file is part of the GNU C Library. |
| 4 | Contributed by Paul Mackerras <paulus@au.ibm.com>, 2003. | |
| 5 | ||
| 6 | The GNU C Library is free software; you can redistribute it and/or | |
| 7 | modify it under the terms of the GNU Lesser General Public | |
| 8 | License as published by the Free Software Foundation; either | |
| 9 | version 2.1 of the License, or (at your option) any later version. | |
| 10 | ||
| 11 | The GNU C Library is distributed in the hope that it will be useful, | |
| 12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
| 14 | Lesser General Public License for more details. | |
| 15 | ||
| 16 | You should have received a copy of the GNU Lesser General Public | |
| 59ba27a6 PE |
17 | License along with the GNU C Library; if not, see |
| 18 | <http://www.gnu.org/licenses/>. */ | |
| b01fe5f7 UD |
19 | |
| 20 | #include <errno.h> | |
| 21 | #include <sysdep.h> | |
| 22 | #include <lowlevellock.h> | |
| 23 | #include <internaltypes.h> | |
| 24 | #include <semaphore.h> | |
| 25 | ||
| 26 | #include <shlib-compat.h> | |
| 27 | ||
| 28 | ||
| 29 | int | |
| 30 | __new_sem_trywait (sem_t *sem) | |
| 31 | { | |
| e4720b0e | 32 | struct sparc_old_sem *isem = (struct sparc_old_sem *) sem; |
| b01fe5f7 UD |
33 | int val; |
| 34 | ||
| e4720b0e | 35 | if (isem->value > 0) |
| b01fe5f7 UD |
36 | { |
| 37 | if (__atomic_is_v9) | |
| e4720b0e | 38 | val = atomic_decrement_if_positive (&isem->value); |
| b01fe5f7 UD |
39 | else |
| 40 | { | |
| e4720b0e JJ |
41 | __sparc32_atomic_do_lock24 (&isem->lock); |
| 42 | val = isem->value; | |
| b01fe5f7 | 43 | if (val > 0) |
| e4720b0e JJ |
44 | isem->value = val - 1; |
| 45 | __sparc32_atomic_do_unlock24 (&isem->lock); | |
| b01fe5f7 UD |
46 | } |
| 47 | if (val > 0) | |
| 48 | return 0; | |
| 49 | } | |
| 50 | ||
| 51 | __set_errno (EAGAIN); | |
| 52 | return -1; | |
| 53 | } | |
| 54 | versioned_symbol (libpthread, __new_sem_trywait, sem_trywait, GLIBC_2_1); | |
| 55 | #if SHLIB_COMPAT (libpthread, GLIBC_2_0, GLIBC_2_1) | |
| 56 | strong_alias (__new_sem_trywait, __old_sem_trywait) | |
| 57 | compat_symbol (libpthread, __old_sem_trywait, sem_trywait, GLIBC_2_0); | |
| 58 | #endif |