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2002-12-12  Ulrich Drepper  <drepper@redhat.com>

	* sysdeps/unix/sysv/linux/fork-gen.c: Renamed to...
	* sysdeps/unix/sysv/linux/libc_pthread_init.c: ...this.
	Initialize __libc_locking_needed.
	* init.c (__pthread_initialize_minimal): Call __libc_pthread_init
	instead of __register_pthread_fork_handler.
	* sysdeps/pthread/bits/libc-lock.h: Declare __libc_locking_needed.
	* sysdeps/unix/sysv/linux/Makefile (sysdep_routimes): Replace
	fork-gen with libc_pthread_init.
	* sysdeps/unix/sysv/linux/Versions: Use __libc_pthread_init instead
	of __register_pthread_fork_handler.
	* sysdeps/unix/sysv/linux/fork.h: Declare __libc_pthread_init instead
	of __register_pthread_fork_handler.
	* sysdeps/unix/sysv/linux/i386/lowlevellock.h: Use
	__libc_locking_needed to determine whether lock prefix can be avoided.
	* sysdeps/unix/sysv/linux/i386/i486/libc-lowlevellock.S: Likewise.
This commit is contained in:
Ulrich Drepper
2002-12-12 10:28:11 +00:00
parent 688e7bfe2b
commit 14e7aeceff
9 changed files with 279 additions and 10 deletions
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60
nptl/sysdeps/unix/sysv/linux/i386/lowlevellock.h
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@ -139,7 +139,8 @@ extern int lll_unlock_wake_cb (int *__futex) attribute_hidden;
<0 - taken by more users */
#define lll_trylock(futex) \
#if defined NOT_IN_libc || defined UP
# define lll_trylock(futex) \
({ unsigned char ret; \
__asm __volatile (LOCK_INSTR "cmpxchgl %2, %1; setne %0" \
: "=a" (ret), "=m" (futex) \
@ -148,7 +149,7 @@ extern int lll_unlock_wake_cb (int *__futex) attribute_hidden;
ret; })
#define lll_lock(futex) \
# define lll_lock(futex) \
(void) ({ int ignore1, ignore2; \
__asm __volatile (LOCK_INSTR "xaddl %0, %2\n\t" \
"jne 1f\n\t" \
@ -163,7 +164,7 @@ extern int lll_unlock_wake_cb (int *__futex) attribute_hidden;
: "memory"); })
#define lll_unlock(futex) \
# define lll_unlock(futex) \
(void) ({ int ignore; \
__asm __volatile (LOCK_INSTR "incl %0\n\t" \
"jng 1f\n\t" \
@ -176,6 +177,59 @@ extern int lll_unlock_wake_cb (int *__futex) attribute_hidden;
: "=m" (futex), "=&a" (ignore) \
: "0" (futex) \
: "memory"); })
#else
/* Special versions of the macros for use in libc itself. They avoid
the lock prefix when the thread library is not used.
XXX In future we might even want to avoid it on UP machines. */
# define lll_trylock(futex) \
({ unsigned char ret; \
__asm __volatile ("cmpl $0, __libc_locking_needed\n\t" \
"je,pt 0f\n\t" \
"lock\n" \
"0:\tcmpxchgl %2, %1; setne %0" \
: "=a" (ret), "=m" (futex) \
: "r" (0), "1" (futex), "0" (1) \
: "memory"); \
ret; })
# define lll_lock(futex) \
(void) ({ int ignore1, ignore2; \
__asm __volatile ("cmpl $0, __libc_locking_needed\n\t" \
"je,pt 0f\n\t" \
"lock\n" \
"0:\txaddl %0, %2\n\t" \
"jne 1f\n\t" \
".subsection 1\n" \
"1:\tleal %2, %%ecx\n\t" \
"call __lll_lock_wait\n\t" \
"jmp 2f\n\t" \
".previous\n" \
"2:" \
: "=a" (ignore1), "=&c" (ignore2), "=m" (futex) \
: "0" (-1), "2" (futex) \
: "memory"); })
# define lll_unlock(futex) \
(void) ({ int ignore; \
__asm __volatile ("cmpl $0, __libc_locking_needed\n\t" \
"je,pt 0f\n\t" \
"lock\n" \
"0:\tincl %0\n\t" \
"jng 1f\n\t" \
".subsection 1\n" \
"1:\tleal %0, %%eax\n\t" \
"call __lll_unlock_wake\n\t" \
"jmp 2f\n\t" \
".previous\n" \
"2:" \
: "=m" (futex), "=&a" (ignore) \
: "0" (futex) \
: "memory"); })
#endif
#define lll_islocked(futex) \