diff options
Diffstat (limited to 'app/nginx/src/core/ngx_shmtx.c')
| -rw-r--r-- | app/nginx/src/core/ngx_shmtx.c | 310 |
1 files changed, 0 insertions, 310 deletions
diff --git a/app/nginx/src/core/ngx_shmtx.c b/app/nginx/src/core/ngx_shmtx.c deleted file mode 100644 index a255903..0000000 --- a/app/nginx/src/core/ngx_shmtx.c +++ /dev/null @@ -1,310 +0,0 @@ - -/* - * Copyright (C) Igor Sysoev - * Copyright (C) Nginx, Inc. - */ - - -#include <ngx_config.h> -#include <ngx_core.h> - - -#if (NGX_HAVE_ATOMIC_OPS) - - -static void ngx_shmtx_wakeup(ngx_shmtx_t *mtx); - - -ngx_int_t -ngx_shmtx_create(ngx_shmtx_t *mtx, ngx_shmtx_sh_t *addr, u_char *name) -{ - mtx->lock = &addr->lock; - - if (mtx->spin == (ngx_uint_t) -1) { - return NGX_OK; - } - - mtx->spin = 2048; - -#if (NGX_HAVE_POSIX_SEM) - - mtx->wait = &addr->wait; - - if (sem_init(&mtx->sem, 1, 0) == -1) { - ngx_log_error(NGX_LOG_ALERT, ngx_cycle->log, ngx_errno, - "sem_init() failed"); - } else { - mtx->semaphore = 1; - } - -#endif - - return NGX_OK; -} - - -void -ngx_shmtx_destroy(ngx_shmtx_t *mtx) -{ -#if (NGX_HAVE_POSIX_SEM) - - if (mtx->semaphore) { - if (sem_destroy(&mtx->sem) == -1) { - ngx_log_error(NGX_LOG_ALERT, ngx_cycle->log, ngx_errno, - "sem_destroy() failed"); - } - } - -#endif -} - - -ngx_uint_t -ngx_shmtx_trylock(ngx_shmtx_t *mtx) -{ - return (*mtx->lock == 0 && ngx_atomic_cmp_set(mtx->lock, 0, ngx_pid)); -} - - -void -ngx_shmtx_lock(ngx_shmtx_t *mtx) -{ - ngx_uint_t i, n; - - ngx_log_debug0(NGX_LOG_DEBUG_CORE, ngx_cycle->log, 0, "shmtx lock"); - - for ( ;; ) { - - if (*mtx->lock == 0 && ngx_atomic_cmp_set(mtx->lock, 0, ngx_pid)) { - return; - } - - if (ngx_ncpu > 1) { - - for (n = 1; n < mtx->spin; n <<= 1) { - - for (i = 0; i < n; i++) { - ngx_cpu_pause(); - } - - if (*mtx->lock == 0 - && ngx_atomic_cmp_set(mtx->lock, 0, ngx_pid)) - { - return; - } - } - } - -#if (NGX_HAVE_POSIX_SEM) - - if (mtx->semaphore) { - (void) ngx_atomic_fetch_add(mtx->wait, 1); - - if (*mtx->lock == 0 && ngx_atomic_cmp_set(mtx->lock, 0, ngx_pid)) { - (void) ngx_atomic_fetch_add(mtx->wait, -1); - return; - } - - ngx_log_debug1(NGX_LOG_DEBUG_CORE, ngx_cycle->log, 0, - "shmtx wait %uA", *mtx->wait); - - while (sem_wait(&mtx->sem) == -1) { - ngx_err_t err; - - err = ngx_errno; - - if (err != NGX_EINTR) { - ngx_log_error(NGX_LOG_ALERT, ngx_cycle->log, err, - "sem_wait() failed while waiting on shmtx"); - break; - } - } - - ngx_log_debug0(NGX_LOG_DEBUG_CORE, ngx_cycle->log, 0, - "shmtx awoke"); - - continue; - } - -#endif - - ngx_sched_yield(); - } -} - - -void -ngx_shmtx_unlock(ngx_shmtx_t *mtx) -{ - if (mtx->spin != (ngx_uint_t) -1) { - ngx_log_debug0(NGX_LOG_DEBUG_CORE, ngx_cycle->log, 0, "shmtx unlock"); - } - - if (ngx_atomic_cmp_set(mtx->lock, ngx_pid, 0)) { - ngx_shmtx_wakeup(mtx); - } -} - - -ngx_uint_t -ngx_shmtx_force_unlock(ngx_shmtx_t *mtx, ngx_pid_t pid) -{ - ngx_log_debug0(NGX_LOG_DEBUG_CORE, ngx_cycle->log, 0, - "shmtx forced unlock"); - - if (ngx_atomic_cmp_set(mtx->lock, pid, 0)) { - ngx_shmtx_wakeup(mtx); - return 1; - } - - return 0; -} - - -static void -ngx_shmtx_wakeup(ngx_shmtx_t *mtx) -{ -#if (NGX_HAVE_POSIX_SEM) - ngx_atomic_uint_t wait; - - if (!mtx->semaphore) { - return; - } - - for ( ;; ) { - - wait = *mtx->wait; - - if ((ngx_atomic_int_t) wait <= 0) { - return; - } - - if (ngx_atomic_cmp_set(mtx->wait, wait, wait - 1)) { - break; - } - } - - ngx_log_debug1(NGX_LOG_DEBUG_CORE, ngx_cycle->log, 0, - "shmtx wake %uA", wait); - - if (sem_post(&mtx->sem) == -1) { - ngx_log_error(NGX_LOG_ALERT, ngx_cycle->log, ngx_errno, - "sem_post() failed while wake shmtx"); - } - -#endif -} - - -#else - - -ngx_int_t -ngx_shmtx_create(ngx_shmtx_t *mtx, ngx_shmtx_sh_t *addr, u_char *name) -{ - if (mtx->name) { - - if (ngx_strcmp(name, mtx->name) == 0) { - mtx->name = name; - return NGX_OK; - } - - ngx_shmtx_destroy(mtx); - } - - mtx->fd = ngx_open_file(name, NGX_FILE_RDWR, NGX_FILE_CREATE_OR_OPEN, - NGX_FILE_DEFAULT_ACCESS); - - if (mtx->fd == NGX_INVALID_FILE) { - ngx_log_error(NGX_LOG_EMERG, ngx_cycle->log, ngx_errno, - ngx_open_file_n " \"%s\" failed", name); - return NGX_ERROR; - } - - if (ngx_delete_file(name) == NGX_FILE_ERROR) { - ngx_log_error(NGX_LOG_ALERT, ngx_cycle->log, ngx_errno, - ngx_delete_file_n " \"%s\" failed", name); - } - - mtx->name = name; - - return NGX_OK; -} - - -void -ngx_shmtx_destroy(ngx_shmtx_t *mtx) -{ - if (ngx_close_file(mtx->fd) == NGX_FILE_ERROR) { - ngx_log_error(NGX_LOG_ALERT, ngx_cycle->log, ngx_errno, - ngx_close_file_n " \"%s\" failed", mtx->name); - } -} - - -ngx_uint_t -ngx_shmtx_trylock(ngx_shmtx_t *mtx) -{ - ngx_err_t err; - - err = ngx_trylock_fd(mtx->fd); - - if (err == 0) { - return 1; - } - - if (err == NGX_EAGAIN) { - return 0; - } - -#if __osf__ /* Tru64 UNIX */ - - if (err == NGX_EACCES) { - return 0; - } - -#endif - - ngx_log_abort(err, ngx_trylock_fd_n " %s failed", mtx->name); - - return 0; -} - - -void -ngx_shmtx_lock(ngx_shmtx_t *mtx) -{ - ngx_err_t err; - - err = ngx_lock_fd(mtx->fd); - - if (err == 0) { - return; - } - - ngx_log_abort(err, ngx_lock_fd_n " %s failed", mtx->name); -} - - -void -ngx_shmtx_unlock(ngx_shmtx_t *mtx) -{ - ngx_err_t err; - - err = ngx_unlock_fd(mtx->fd); - - if (err == 0) { - return; - } - - ngx_log_abort(err, ngx_unlock_fd_n " %s failed", mtx->name); -} - - -ngx_uint_t -ngx_shmtx_force_unlock(ngx_shmtx_t *mtx, ngx_pid_t pid) -{ - return 0; -} - -#endif |