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larx/stcx. should cycle if the reservation was cleared

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This commit is contained in:
Igor Sysoev 2006-12-21 15:20:15 +00:00
parent 4e08b9c17a
commit 053d1c4da8
1 changed files with 8 additions and 6 deletions
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14
src/os/unix/ngx_gcc_atomic_ppc.h
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@ -28,15 +28,16 @@ ngx_atomic_cmp_set(ngx_atomic_t *lock, ngx_atomic_uint_t old,
__asm__ volatile (
" li %0, 0 \n" /* preset "0" to "res" */
"1: \n"
" ldarx %1, 0, %2 \n" /* load from [lock] into "temp" */
/* and store reservation */
" cmpd %1, %3 \n" /* compare "temp" and "old" */
" bne- 1f \n" /* not equal */
" bne- 2f \n" /* not equal */
" stdcx. %4, 0, %2 \n" /* store "set" into [lock] if reservation */
/* is not cleared */
" bne- 1f \n" /* the reservation was cleared */
" bne- 1b \n" /* the reservation was cleared */
" li %0, 1 \n" /* set "1" to "res" */
"1: \n"
"2: \n"
: "=&b" (res), "=&b" (temp)
: "b" (lock), "b" (old), "b" (set)
@ -85,15 +86,16 @@ ngx_atomic_cmp_set(ngx_atomic_t *lock, ngx_atomic_uint_t old,
__asm__ volatile (
" li %0, 0 \n" /* preset "0" to "res" */
"1: \n"
" lwarx %1, 0, %2 \n" /* load from [lock] into "temp" */
/* and store reservation */
" cmpw %1, %3 \n" /* compare "temp" and "old" */
" bne- 1f \n" /* not equal */
" bne- 2f \n" /* not equal */
" stwcx. %4, 0, %2 \n" /* store "set" into [lock] if reservation */
/* is not cleared */
" bne- 1f \n" /* the reservation was cleared */
" bne- 1b \n" /* the reservation was cleared */
" li %0, 1 \n" /* set "1" to "res" */
"1: \n"
"2: \n"
: "=&b" (res), "=&b" (temp)
: "b" (lock), "b" (old), "b" (set)