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* sysdeps/unix/sysv/linux/sem_post.c: Only wake threads if old

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value of semaphore was zero.
	* sysdeps/unix/sysv/linux/i386/i486/sem_post.S: Likewise.
	* sysdeps/unix/sysv/linux/powerpc/sem_post.c: Likewise.
	* sysdeps/unix/sysv/linux/sparc/sparc32/sem_post.c: Likewise.
	* sysdeps/unix/sysv/linux/x86_64/sem_post.S: Likewise.

	* sysdeps/unix/sysv/linux/x86_64/sem_wait.S: Remove unnecessary
	extra cancellation test.
	* sysdeps/unix/sysv/linux/x86_64/sem_timedwait.S: Likewise.
This commit is contained in:
Ulrich Drepper 2007-05-15 06:24:31 +00:00
parent 1d47e92f71
commit 83d87915da
8 changed files with 50 additions and 54 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

13
nptl/ChangeLog
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@ -1,3 +1,16 @@
2007-05-14 Ulrich Drepper <drepper@redhat.com>
* sysdeps/unix/sysv/linux/sem_post.c: Only wake threads if old
value of semaphore was zero.
* sysdeps/unix/sysv/linux/i386/i486/sem_post.S: Likewise.
* sysdeps/unix/sysv/linux/powerpc/sem_post.c: Likewise.
* sysdeps/unix/sysv/linux/sparc/sparc32/sem_post.c: Likewise.
* sysdeps/unix/sysv/linux/x86_64/sem_post.S: Likewise.
* sysdeps/unix/sysv/linux/x86_64/sem_wait.S: Remove unnecessary
extra cancellation test.
* sysdeps/unix/sysv/linux/x86_64/sem_timedwait.S: Likewise.
2007-05-10 Ulrich Drepper <drepper@redhat.com>
* descr.h (struct pthread): Rearrange members to fill hole in

7
nptl/sysdeps/unix/sysv/linux/i386/i486/sem_post.S
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@ -1,4 +1,4 @@
/* Copyright (C) 2002, 2003, 2005 Free Software Foundation, Inc.
/* Copyright (C) 2002, 2003, 2005, 2007 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Ulrich Drepper <drepper@redhat.com>, 2002.
@ -44,9 +44,12 @@ __new_sem_post:
LOCK
xaddl %edx, (%ebx)
testl %edx, %edx
jne 2f
movl $SYS_futex, %eax
movl $FUTEX_WAKE, %ecx
addl $1, %edx
movl $1, %edx
ENTER_KERNEL
testl %eax, %eax

14
nptl/sysdeps/unix/sysv/linux/powerpc/sem_post.c
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@ -1,5 +1,5 @@
/* sem_post -- post to a POSIX semaphore. Powerpc version.
Copyright (C) 2003, 2004 Free Software Foundation, Inc.
Copyright (C) 2003, 2004, 2007 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Paul Mackerras <paulus@au.ibm.com>, 2003.
@ -32,12 +32,14 @@ __new_sem_post (sem_t *sem)
int *futex = (int *) sem;
__asm __volatile (__lll_rel_instr ::: "memory");
int nr = atomic_increment_val (futex);
int err = lll_futex_wake (futex, nr);
if (__builtin_expect (err, 0) < 0)
if (atomic_increment_val (futex) == 1)
{
__set_errno (-err);
return -1;
int err = lll_futex_wake (futex, 1);
if (__builtin_expect (err, 0) < 0)
{
__set_errno (-err);
return -1;
}
}
return 0;
}

14
nptl/sysdeps/unix/sysv/linux/sem_post.c
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@ -1,5 +1,5 @@
/* sem_post -- post to a POSIX semaphore. Generic futex-using version.
Copyright (C) 2003, 2004 Free Software Foundation, Inc.
Copyright (C) 2003, 2004, 2007 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Jakub Jelinek <jakub@redhat.com>, 2003.
@ -31,12 +31,14 @@ __new_sem_post (sem_t *sem)
{
int *futex = (int *) sem;
int nr = atomic_increment_val (futex);
int err = lll_futex_wake (futex, nr);
if (__builtin_expect (err, 0) < 0)
if (atomic_increment_val (futex) == 1)
{
__set_errno (-err);
return -1;
int err = lll_futex_wake (futex, 1);
if (__builtin_expect (err, 0) < 0)
{
__set_errno (-err);
return -1;
}
}
return 0;
}

13
nptl/sysdeps/unix/sysv/linux/sparc/sparc32/sem_post.c
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@ -1,5 +1,5 @@
/* sem_post -- post to a POSIX semaphore. SPARC version.
Copyright (C) 2003, 2004, 2006 Free Software Foundation, Inc.
Copyright (C) 2003, 2004, 2006, 2007 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Jakub Jelinek <jakub@redhat.com>, 2003.
@ -39,11 +39,14 @@ __new_sem_post (sem_t *sem)
nr = ++*futex;
__sparc32_atomic_do_unlock24 (futex + 1);
}
int err = lll_futex_wake (futex, nr);
if (__builtin_expect (err, 0) < 0)
if (nr == 1)
{
__set_errno (-err);
return -1;
int err = lll_futex_wake (futex, 1);
if (__builtin_expect (err, 0) < 0)
{
__set_errno (-err);
return -1;
}
}
return 0;
}

9
nptl/sysdeps/unix/sysv/linux/x86_64/sem_post.S
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@ -1,4 +1,4 @@
/* Copyright (C) 2002, 2003, 2005 Free Software Foundation, Inc.
/* Copyright (C) 2002, 2003, 2005, 2007 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Ulrich Drepper <drepper@redhat.com>, 2002.
@ -41,15 +41,18 @@ sem_post:
LOCK
xaddl %edx, (%rdi)
testl %edx, %edx
jne 2f
movl $SYS_futex, %eax
movl $FUTEX_WAKE, %esi
incl %edx
movl $1, %edx
syscall
testq %rax, %rax
js 1f
xorl %eax, %eax
2: xorl %eax, %eax
retq
1:

19
nptl/sysdeps/unix/sysv/linux/x86_64/sem_timedwait.S
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@ -1,4 +1,4 @@
/* Copyright (C) 2002, 2003, 2005 Free Software Foundation, Inc.
/* Copyright (C) 2002, 2003, 2005, 2007 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Ulrich Drepper <drepper@redhat.com>, 2002.
@ -40,12 +40,6 @@
.align 16
cfi_startproc
sem_timedwait:
/* First check for cancellation. */
movl %fs:CANCELHANDLING, %eax
andl $0xfffffff9, %eax
cmpl $8, %eax
je 11f
movl (%rdi), %eax
2: testl %eax, %eax
je 1f
@ -160,16 +154,5 @@ sem_timedwait:
orl $-1, %eax
jmp 10b
cfi_adjust_cfa_offset(-48)
cfi_restore(14)
cfi_restore(13)
cfi_restore(12)
11: /* Canceled. */
movq $0xffffffffffffffff, %fs:RESULT
LOCK
orl $0x10, %fs:CANCELHANDLING
movq %fs:CLEANUP_JMP_BUF, %rdi
jmp HIDDEN_JUMPTARGET (__pthread_unwind)
cfi_endproc
.size sem_timedwait,.-sem_timedwait

15
nptl/sysdeps/unix/sysv/linux/x86_64/sem_wait.S
View File

@ -1,4 +1,4 @@
/* Copyright (C) 2002, 2003, 2005 Free Software Foundation, Inc.
/* Copyright (C) 2002, 2003, 2005, 2007 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Ulrich Drepper <drepper@redhat.com>, 2002.
@ -37,12 +37,6 @@
.align 16
cfi_startproc
sem_wait:
/* First check for cancellation. */
movl %fs:CANCELHANDLING, %eax
andl $0xfffffff9, %eax
cmpl $8, %eax
je 4f
pushq %r12
cfi_adjust_cfa_offset(8)
cfi_offset(12, -16)
@ -109,12 +103,5 @@ sem_wait:
cfi_restore(12)
retq
4: /* Canceled. */
movq $0xffffffffffffffff, %fs:RESULT
LOCK
orl $0x10, %fs:CANCELHANDLING
movq %fs:CLEANUP_JMP_BUF, %rdi
jmp HIDDEN_JUMPTARGET (__pthread_unwind)
cfi_endproc
.size sem_wait,.-sem_wait