projects / thirdparty / glibc.git / blame
| Commit | Line | Data |
|---|---|---|
| d0aacb47 UD |
1 | /* Copyright (C) 2002, 2003 Free Software Foundation, Inc. |
| 2 | This file is part of the GNU C Library. | |
| 3 | Contributed by Ulrich Drepper <drepper@redhat.com>, 2002. | |
| 4 | ||
| 5 | The GNU C Library is free software; you can redistribute it and/or | |
| 6 | modify it under the terms of the GNU Lesser General Public | |
| 7 | License as published by the Free Software Foundation; either | |
| 8 | version 2.1 of the License, or (at your option) any later version. | |
| 9 | ||
| 10 | The GNU C Library is distributed in the hope that it will be useful, | |
| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
| 13 | Lesser General Public License for more details. | |
| 14 | ||
| 15 | You should have received a copy of the GNU Lesser General Public | |
| 16 | License along with the GNU C Library; if not, write to the Free | |
| 17 | Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA | |
| 18 | 02111-1307 USA. */ | |
| 19 | ||
| 20 | #include <sysdep.h> | |
| 21 | #include <shlib-compat.h> | |
| 22 | #include <lowlevelcond.h> | |
| 23 | ||
| 24 | #ifdef UP | |
| 25 | # define LOCK | |
| 26 | #else | |
| 27 | # define LOCK lock | |
| 28 | #endif | |
| 29 | ||
| 30 | #define SYS_futex 202 | |
| 31 | #define FUTEX_WAIT 0 | |
| 32 | #define FUTEX_WAKE 1 | |
| 33 | ||
| 34 | ||
| 35 | .text | |
| 36 | ||
| 37 | /* int pthread_cond_signal (pthread_cond_t *cond) */ | |
| 38 | .globl __pthread_cond_signal | |
| 39 | .type __pthread_cond_signal, @function | |
| 40 | .align 16 | |
| 41 | __pthread_cond_signal: | |
| 42 | ||
| 43 | /* Get internal lock. */ | |
| 44 | movl $1, %esi | |
| 45 | LOCK | |
| 46 | #if cond_lock == 0 | |
| 47 | xaddl %esi, (%rdi) | |
| 48 | #else | |
| 49 | xaddl %esi, cond_lock(%rdi) | |
| 50 | #endif | |
| 51 | testl %esi, %esi | |
| 52 | jne 1f | |
| 53 | ||
| 54 | 2: addq $wakeup_seq, %rdi | |
| 55 | movq total_seq-wakeup_seq(%rdi), %rcx | |
| 56 | cmpq (%rdi), %rcx | |
| 57 | jbe 4f | |
| 58 | ||
| 59 | /* Bump the wakeup number. */ | |
| 60 | addq $1, (%rdi) | |
| 61 | ||
| 62 | /* Wake up one thread. */ | |
| 63 | movq $FUTEX_WAKE, %rsi | |
| 64 | movq $SYS_futex, %rax | |
| 5a03acfe | 65 | movq %rsi, %rdx /* movl $1, %edx */ |
| d0aacb47 UD |
66 | syscall |
| 67 | ||
| 68 | /* Unlock. */ | |
| 69 | 4: LOCK | |
| 70 | decl cond_lock-wakeup_seq(%rdi) | |
| 71 | jne 5f | |
| 72 | ||
| 73 | 6: xorl %eax, %eax | |
| 74 | retq | |
| 75 | ||
| 76 | /* Initial locking failed. */ | |
| 77 | 1: | |
| 78 | #if cond_lock != 0 | |
| 79 | addq $cond_lock, %rdi | |
| 80 | #endif | |
| 6c477888 | 81 | callq __lll_mutex_lock_wait |
| d0aacb47 UD |
82 | #if cond_lock != 0 |
| 83 | subq $cond_lock, %rdi | |
| 84 | #endif | |
| 85 | jmp 2b | |
| 86 | ||
| 87 | /* Unlock in loop requires waekup. */ | |
| 6c477888 UD |
88 | 5: addq $cond_lock-wakeup_seq, %rdi |
| 89 | callq __lll_mutex_unlock_wake | |
| d0aacb47 UD |
90 | jmp 6b |
| 91 | .size __pthread_cond_signal, .-__pthread_cond_signal | |
| 92 | versioned_symbol (libpthread, __pthread_cond_signal, pthread_cond_signal, | |
| 93 | GLIBC_2_3_2) |