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2002-12-12 Roland McGrath <roland@redhat.com>

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* sysdeps/unix/sysv/linux/i386/lowlevellock.h: Use asm operand with
	"m" constraint to refer to __libc_locking_needed.  Declare it here.
This commit is contained in:
Roland McGrath 2002-12-12 12:54:18 +00:00
parent 14e7aeceff
commit be180f6f3b
1 changed files with 11 additions and 6 deletions
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17
nptl/sysdeps/unix/sysv/linux/i386/lowlevellock.h
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@ -183,21 +183,25 @@ extern int lll_unlock_wake_cb (int *__futex) attribute_hidden;
XXX In future we might even want to avoid it on UP machines. */
/* Nonzero if locking is needed. */
extern int __libc_locking_needed attribute_hidden;
# define lll_trylock(futex) \
({ unsigned char ret; \
__asm __volatile ("cmpl $0, __libc_locking_needed\n\t" \
__asm __volatile ("cmpl $0, %5\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) \
: "r" (0), "1" (futex), "0" (1), \
"m" (__libc_locking_needed) \
: "memory"); \
ret; })
# define lll_lock(futex) \
(void) ({ int ignore1, ignore2; \
__asm __volatile ("cmpl $0, __libc_locking_needed\n\t" \
__asm __volatile ("cmpl $0, %5\n\t" \
"je,pt 0f\n\t" \
"lock\n" \
"0:\txaddl %0, %2\n\t" \
@ -209,13 +213,14 @@ extern int lll_unlock_wake_cb (int *__futex) attribute_hidden;
".previous\n" \
"2:" \
: "=a" (ignore1), "=&c" (ignore2), "=m" (futex) \
: "0" (-1), "2" (futex) \
: "0" (-1), "2" (futex), \
"m" (__libc_locking_needed) \
: "memory"); })
# define lll_unlock(futex) \
(void) ({ int ignore; \
__asm __volatile ("cmpl $0, __libc_locking_needed\n\t" \
__asm __volatile ("cmpl $0, %3\n\t" \
"je,pt 0f\n\t" \
"lock\n" \
"0:\tincl %0\n\t" \
@ -227,7 +232,7 @@ extern int lll_unlock_wake_cb (int *__futex) attribute_hidden;
".previous\n" \
"2:" \
: "=m" (futex), "=&a" (ignore) \
: "0" (futex) \
: "0" (futex), "m" (__libc_locking_needed) \
: "memory"); })
#endif