Mercurial > hg > nginx
annotate src/core/ngx_shmtx.h @ 860:201d017ea470
slab allocator in shared memory
| author | Igor Sysoev <igor@sysoev.ru> |
|---|---|
| date | Mon, 20 Nov 2006 08:51:45 +0000 |
| parents | 3f8a2132b93d |
| children | 51d0884364fe |
| rev | line source |
|---|---|
| 611 | 1 |
| 2 /* | |
| 3 * Copyright (C) Igor Sysoev | |
| 4 */ | |
| 5 | |
| 6 | |
| 7 #ifndef _NGX_SHMTX_H_INCLUDED_ | |
| 8 #define _NGX_SHMTX_H_INCLUDED_ | |
| 9 | |
| 10 | |
| 11 #include <ngx_config.h> | |
| 12 #include <ngx_core.h> | |
| 13 | |
| 14 | |
| 15 typedef struct { | |
| 16 #if (NGX_HAVE_ATOMIC_OPS) | |
| 17 ngx_atomic_t *lock; | |
| 18 #else | |
| 19 ngx_fd_t fd; | |
| 20 u_char *name; | |
| 21 #endif | |
| 22 } ngx_shmtx_t; | |
| 23 | |
| 24 | |
|
860
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
611
diff
changeset
|
25 ngx_int_t ngx_shmtx_create(ngx_shmtx_t *mtx, void *addr, u_char *name); |
| 611 | 26 |
| 27 | |
| 28 #if (NGX_HAVE_ATOMIC_OPS) | |
| 29 | |
| 30 static ngx_inline ngx_uint_t | |
| 31 ngx_shmtx_trylock(ngx_shmtx_t *mtx) | |
| 32 { | |
| 33 if (*mtx->lock == 0 && ngx_atomic_cmp_set(mtx->lock, 0, ngx_pid)) { | |
| 34 return 1; | |
| 35 } | |
| 36 | |
| 37 return 0; | |
| 38 } | |
| 39 | |
| 40 #define ngx_shmtx_lock(mtx) ngx_spinlock((mtx)->lock, ngx_pid, 1024) | |
| 41 | |
| 42 #define ngx_shmtx_unlock(mtx) (void) ngx_atomic_cmp_set((mtx)->lock, ngx_pid, 0) | |
| 43 | |
| 44 #define ngx_shmtx_destory(mtx) | |
| 45 | |
| 46 | |
| 47 #else | |
| 48 | |
| 49 static ngx_inline ngx_uint_t | |
| 50 ngx_shmtx_trylock(ngx_shmtx_t *mtx) | |
| 51 { | |
| 52 ngx_err_t err; | |
| 53 | |
| 54 err = ngx_trylock_fd(mtx->fd); | |
| 55 | |
| 56 if (err == 0) { | |
| 57 return 1; | |
| 58 } | |
| 59 | |
| 60 if (err == NGX_EAGAIN) { | |
| 61 return 0; | |
| 62 } | |
| 63 | |
|
860
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
611
diff
changeset
|
64 ngx_log_abort(err, ngx_trylock_fd_n " failed"); |
| 611 | 65 } |
| 66 | |
| 67 | |
| 68 static ngx_inline void | |
| 69 ngx_shmtx_lock(ngx_shmtx_t *mtx) | |
| 70 { | |
| 71 ngx_err_t err; | |
| 72 | |
| 73 err = ngx_lock_fd(mtx->fd); | |
| 74 | |
| 75 if (err == 0) { | |
| 76 return; | |
| 77 } | |
| 78 | |
|
860
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
611
diff
changeset
|
79 ngx_log_abort(err, ngx_lock_fd_n " failed"); |
| 611 | 80 } |
| 81 | |
| 82 | |
| 83 static ngx_inline void | |
| 84 ngx_shmtx_unlock(ngx_shmtx_t *mtx) | |
| 85 { | |
| 86 ngx_err_t err; | |
| 87 | |
| 88 err = ngx_unlock_fd(mtx->fd); | |
| 89 | |
| 90 if (err == 0) { | |
| 91 return; | |
| 92 } | |
| 93 | |
|
860
201d017ea470
slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
611
diff
changeset
|
94 ngx_log_abort(err, ngx_unlock_fd_n " failed"); |
| 611 | 95 } |
| 96 | |
| 97 | |
| 98 void ngx_shmtx_destory(ngx_shmtx_t *mtx); | |
| 99 | |
| 100 #endif | |
| 101 | |
| 102 | |
| 103 #endif /* _NGX_SHMTX_H_INCLUDED_ */ |