mirror/nginx
1
0
Fork 0
mirror of https://github.com/nginx/nginx.git synced 2024-12-12 10:19:00 +08:00
Code Issues Actions Packages Projects Releases Wiki Activity

larx/stcx. should cycle if the reservation was cleared

Browse Source
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
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

14
src/os/unix/ngx_gcc_atomic_ppc.h
View File

@ -28,15 +28,16 @@ ngx_atomic_cmp_set(ngx_atomic_t *lock, ngx_atomic_uint_t old,
__asm__ volatile ( __asm__ volatile (
" li %0, 0 \n" /* preset "0" to "res" */ " li %0, 0 \n" /* preset "0" to "res" */
"1: \n"
" ldarx %1, 0, %2 \n" /* load from [lock] into "temp" */ " ldarx %1, 0, %2 \n" /* load from [lock] into "temp" */
/* and store reservation */ /* and store reservation */
" cmpd %1, %3 \n" /* compare "temp" and "old" */ " 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 */ " stdcx. %4, 0, %2 \n" /* store "set" into [lock] if reservation */
/* is not cleared */ /* 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" */ " li %0, 1 \n" /* set "1" to "res" */
"1: \n" "2: \n"
: "=&b" (res), "=&b" (temp) : "=&b" (res), "=&b" (temp)
: "b" (lock), "b" (old), "b" (set) : "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 ( __asm__ volatile (
" li %0, 0 \n" /* preset "0" to "res" */ " li %0, 0 \n" /* preset "0" to "res" */
"1: \n"
" lwarx %1, 0, %2 \n" /* load from [lock] into "temp" */ " lwarx %1, 0, %2 \n" /* load from [lock] into "temp" */
/* and store reservation */ /* and store reservation */
" cmpw %1, %3 \n" /* compare "temp" and "old" */ " 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 */ " stwcx. %4, 0, %2 \n" /* store "set" into [lock] if reservation */
/* is not cleared */ /* 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" */ " li %0, 1 \n" /* set "1" to "res" */
"1: \n" "2: \n"
: "=&b" (res), "=&b" (temp) : "=&b" (res), "=&b" (temp)
: "b" (lock), "b" (old), "b" (set) : "b" (lock), "b" (old), "b" (set)