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annotate src/core/ngx_shmtx.h @ 3947:7890c9617eb5 stable-0.8
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| author | Igor Sysoev <igor@sysoev.ru> |
|---|---|
| date | Tue, 19 Jul 2011 13:49:44 +0000 |
| parents | e345fcf61a12 |
| children | 0daede16d68b |
| 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 | |
|
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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 { | |
| 1008 | 33 return (*mtx->lock == 0 && ngx_atomic_cmp_set(mtx->lock, 0, ngx_pid)); |
| 611 | 34 } |
| 35 | |
| 36 #define ngx_shmtx_lock(mtx) ngx_spinlock((mtx)->lock, ngx_pid, 1024) | |
| 37 | |
| 38 #define ngx_shmtx_unlock(mtx) (void) ngx_atomic_cmp_set((mtx)->lock, ngx_pid, 0) | |
| 39 | |
| 40 #define ngx_shmtx_destory(mtx) | |
| 41 | |
| 42 | |
| 43 #else | |
| 44 | |
| 45 static ngx_inline ngx_uint_t | |
| 46 ngx_shmtx_trylock(ngx_shmtx_t *mtx) | |
| 47 { | |
| 48 ngx_err_t err; | |
| 49 | |
| 50 err = ngx_trylock_fd(mtx->fd); | |
| 51 | |
| 52 if (err == 0) { | |
| 53 return 1; | |
| 54 } | |
| 55 | |
| 56 if (err == NGX_EAGAIN) { | |
| 57 return 0; | |
| 58 } | |
| 59 | |
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60 #if __osf__ /* Tru64 UNIX */ |
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61 |
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62 if (err == NGX_EACCESS) { |
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Igor Sysoev <igor@sysoev.ru>
parents:
1106
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63 return 0; |
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e345fcf61a12
compatibility with Tru64 UNIX: fcntl(F_SETLK, F_WRLCK) returns EINVAL if busy
Igor Sysoev <igor@sysoev.ru>
parents:
1106
diff
changeset
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64 } |
|
e345fcf61a12
compatibility with Tru64 UNIX: fcntl(F_SETLK, F_WRLCK) returns EINVAL if busy
Igor Sysoev <igor@sysoev.ru>
parents:
1106
diff
changeset
|
65 |
|
e345fcf61a12
compatibility with Tru64 UNIX: fcntl(F_SETLK, F_WRLCK) returns EINVAL if busy
Igor Sysoev <igor@sysoev.ru>
parents:
1106
diff
changeset
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66 #endif |
|
e345fcf61a12
compatibility with Tru64 UNIX: fcntl(F_SETLK, F_WRLCK) returns EINVAL if busy
Igor Sysoev <igor@sysoev.ru>
parents:
1106
diff
changeset
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67 |
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e345fcf61a12
compatibility with Tru64 UNIX: fcntl(F_SETLK, F_WRLCK) returns EINVAL if busy
Igor Sysoev <igor@sysoev.ru>
parents:
1106
diff
changeset
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68 ngx_log_abort(err, ngx_trylock_fd_n " %s failed", mtx->name); |
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69 |
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fix building on platforms with non-supported atomic operations
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parents:
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70 return 0; |
| 611 | 71 } |
| 72 | |
| 73 | |
| 74 static ngx_inline void | |
| 75 ngx_shmtx_lock(ngx_shmtx_t *mtx) | |
| 76 { | |
| 77 ngx_err_t err; | |
| 78 | |
| 79 err = ngx_lock_fd(mtx->fd); | |
| 80 | |
| 81 if (err == 0) { | |
| 82 return; | |
| 83 } | |
| 84 | |
|
2563
e345fcf61a12
compatibility with Tru64 UNIX: fcntl(F_SETLK, F_WRLCK) returns EINVAL if busy
Igor Sysoev <igor@sysoev.ru>
parents:
1106
diff
changeset
|
85 ngx_log_abort(err, ngx_lock_fd_n " %s failed", mtx->name); |
| 611 | 86 } |
| 87 | |
| 88 | |
| 89 static ngx_inline void | |
| 90 ngx_shmtx_unlock(ngx_shmtx_t *mtx) | |
| 91 { | |
| 92 ngx_err_t err; | |
| 93 | |
| 94 err = ngx_unlock_fd(mtx->fd); | |
| 95 | |
| 96 if (err == 0) { | |
| 97 return; | |
| 98 } | |
| 99 | |
|
2563
e345fcf61a12
compatibility with Tru64 UNIX: fcntl(F_SETLK, F_WRLCK) returns EINVAL if busy
Igor Sysoev <igor@sysoev.ru>
parents:
1106
diff
changeset
|
100 ngx_log_abort(err, ngx_unlock_fd_n " %s failed", mtx->name); |
| 611 | 101 } |
| 102 | |
| 103 | |
| 104 void ngx_shmtx_destory(ngx_shmtx_t *mtx); | |
| 105 | |
| 106 #endif | |
| 107 | |
| 108 | |
| 109 #endif /* _NGX_SHMTX_H_INCLUDED_ */ |