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comparison src/os/unix/ngx_gcc_atomic_amd64.h @ 274:052a7b1d40e5 NGINX_0_5_7

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nginx 0.5.7 *) Feature: the ssl_session_cache storage optimization. *) Bugfixes in the "ssl_session_cache" and "limit_zone" directives. *) Bugfix: the segmentation fault was occurred on start or while reconfiguration if the "ssl_session_cache" or "limit_zone" directives were used on 64-bit platforms. *) Bugfix: a segmentation fault occurred if the "add_before_body" or "add_after_body" directives were used and there was no "Content-Type" header line in response. *) Bugfix: the OpenSSL library was always built with the threads support. Thanks to Den Ivanov. *) Bugfix: the PCRE-6.5+ library and the icc compiler compatibility.
author Igor Sysoev <http://sysoev.ru>
date Mon, 15 Jan 2007 00:00:00 +0300
parents 73e8476f9142
children d0f7a625f27c
comparison
equal deleted inserted replaced
273:60df8db42ffb 274:052a7b1d40e5
22 * rax = [m]; 22 * rax = [m];
23 * } 23 * }
24 * 24 *
25 * 25 *
26 * The "r" is any register, %rax (%r0) - %r16. 26 * The "r" is any register, %rax (%r0) - %r16.
27 * The "=a" and "a" are the %rax register. Although we can return result 27 * The "=a" and "a" are the %rax register.
28 * in any register, we use %rax because it is used in cmpxchgq anyway. 28 * Although we can return result in any register, we use "a" because it is
29 * used in cmpxchgq anyway. The result is actually in %al but not in $rax,
30 * however as the code is inlined gcc can test %al as well as %rax.
31 *
29 * The "cc" means that flags were changed. 32 * The "cc" means that flags were changed.
30 */ 33 */
31 34
32 static ngx_inline ngx_atomic_uint_t 35 static ngx_inline ngx_atomic_uint_t
33 ngx_atomic_cmp_set(ngx_atomic_t *lock, ngx_atomic_uint_t old, 36 ngx_atomic_cmp_set(ngx_atomic_t *lock, ngx_atomic_uint_t old,
34 ngx_atomic_uint_t set) 37 ngx_atomic_uint_t set)
35 { 38 {
36 ngx_atomic_uint_t res; 39 u_char res;
37 40
38 __asm__ volatile ( 41 __asm__ volatile (
39 42
40 NGX_SMP_LOCK 43 NGX_SMP_LOCK
41 " cmpxchgq %3, %1; " 44 " cmpxchgq %3, %1; "
42 " setz %b0; " 45 " sete %0; "
43 " movzbq %b0, %0; "
44 46
45 : "=a" (res) : "m" (*lock), "a" (old), "r" (set) : "cc", "memory"); 47 : "=a" (res) : "m" (*lock), "a" (old), "r" (set) : "cc", "memory");
46 48
47 return res; 49 return res;
48 } 50 }
66 __asm__ volatile ( 68 __asm__ volatile (
67 69
68 NGX_SMP_LOCK 70 NGX_SMP_LOCK
69 " xaddq %0, %1; " 71 " xaddq %0, %1; "
70 72
71 : "+q" (add) : "m" (*value) : "cc", "memory"); 73 : "+r" (add) : "m" (*value) : "cc", "memory");
72 74
73 return add; 75 return add;
74 } 76 }
75 77
76 78