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| author | Roland McGrath <roland@gnu.org> | 2002-12-12 12:54:18 +0000 |
|---|---|---|
| committer | Roland McGrath <roland@gnu.org> | 2002-12-12 12:54:18 +0000 |
| commit | be180f6f3b27fd0a7701858be27591a9b6e7d9a9 (patch) | |
| tree | ffb25171941fdae42af0a3f9e5e2d9748cd41cce /nptl/sysdeps | |
| parent | 14e7aeceff58b18f970126e1562b0dbf340e2d6c (diff) | |
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2002-12-12 Roland McGrath <roland@redhat.com>
* sysdeps/unix/sysv/linux/i386/lowlevellock.h: Use asm operand with
"m" constraint to refer to __libc_locking_needed. Declare it here.
Diffstat (limited to 'nptl/sysdeps')
| -rw-r--r-- | nptl/sysdeps/unix/sysv/linux/i386/lowlevellock.h | 17 |
1 files changed, 11 insertions, 6 deletions
diff --git a/nptl/sysdeps/unix/sysv/linux/i386/lowlevellock.h b/nptl/sysdeps/unix/sysv/linux/i386/lowlevellock.h index 470dcf6108..94c0314c12 100644 --- a/nptl/sysdeps/unix/sysv/linux/i386/lowlevellock.h +++ b/nptl/sysdeps/unix/sysv/linux/i386/lowlevellock.h @@ -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 |