diff options
Diffstat (limited to 'app/nginx/src/os/unix/ngx_thread_mutex.c')
| -rw-r--r-- | app/nginx/src/os/unix/ngx_thread_mutex.c | 165 |
1 files changed, 0 insertions, 165 deletions
diff --git a/app/nginx/src/os/unix/ngx_thread_mutex.c b/app/nginx/src/os/unix/ngx_thread_mutex.c deleted file mode 100644 index 4886f49..0000000 --- a/app/nginx/src/os/unix/ngx_thread_mutex.c +++ /dev/null @@ -1,165 +0,0 @@ - -/* - * Copyright (C) Igor Sysoev - * Copyright (C) Nginx, Inc. - */ - -#include <ngx_config.h> -#include <ngx_core.h> - - -/* - * All modern pthread mutex implementations try to acquire a lock - * atomically in userland before going to sleep in kernel. Some - * spins before the sleeping. - * - * In Solaris since version 8 all mutex types spin before sleeping. - * The default spin count is 1000. It can be overridden using - * _THREAD_ADAPTIVE_SPIN=100 environment variable. - * - * In MacOSX all mutex types spin to acquire a lock protecting a mutex's - * internals. If the mutex is busy, thread calls Mach semaphore_wait(). - * - * - * PTHREAD_MUTEX_NORMAL lacks deadlock detection and is the fastest - * mutex type. - * - * Linux: No spinning. The internal name PTHREAD_MUTEX_TIMED_NP - * remains from the times when pthread_mutex_timedlock() was - * non-standard extension. Alias name: PTHREAD_MUTEX_FAST_NP. - * FreeBSD: No spinning. - * - * - * PTHREAD_MUTEX_ERRORCHECK is usually as fast as PTHREAD_MUTEX_NORMAL - * yet has lightweight deadlock detection. - * - * Linux: No spinning. The internal name: PTHREAD_MUTEX_ERRORCHECK_NP. - * FreeBSD: No spinning. - * - * - * PTHREAD_MUTEX_RECURSIVE allows recursive locking. - * - * Linux: No spinning. The internal name: PTHREAD_MUTEX_RECURSIVE_NP. - * FreeBSD: No spinning. - * - * - * PTHREAD_MUTEX_ADAPTIVE_NP spins on SMP systems before sleeping. - * - * Linux: No deadlock detection. Dynamically changes a spin count - * for each mutex from 10 to 100 based on spin count taken - * previously. - * FreeBSD: Deadlock detection. The default spin count is 2000. - * It can be overridden using LIBPTHREAD_SPINLOOPS environment - * variable or by pthread_mutex_setspinloops_np(). If a lock - * is still busy, sched_yield() can be called on both UP and - * SMP systems. The default yield loop count is zero, but - * it can be set by LIBPTHREAD_YIELDLOOPS environment - * variable or by pthread_mutex_setyieldloops_np(). - * Solaris: No PTHREAD_MUTEX_ADAPTIVE_NP. - * MacOSX: No PTHREAD_MUTEX_ADAPTIVE_NP. - * - * - * PTHREAD_MUTEX_ELISION_NP is a Linux extension to elide locks using - * Intel Restricted Transactional Memory. It is the most suitable for - * rwlock pattern access because it allows simultaneous reads without lock. - * Supported since glibc 2.18. - * - * - * PTHREAD_MUTEX_DEFAULT is default mutex type. - * - * Linux: PTHREAD_MUTEX_NORMAL. - * FreeBSD: PTHREAD_MUTEX_ERRORCHECK. - * Solaris: PTHREAD_MUTEX_NORMAL. - * MacOSX: PTHREAD_MUTEX_NORMAL. - */ - - -ngx_int_t -ngx_thread_mutex_create(ngx_thread_mutex_t *mtx, ngx_log_t *log) -{ - ngx_err_t err; - pthread_mutexattr_t attr; - - err = pthread_mutexattr_init(&attr); - if (err != 0) { - ngx_log_error(NGX_LOG_EMERG, log, err, - "pthread_mutexattr_init() failed"); - return NGX_ERROR; - } - - err = pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_ERRORCHECK); - if (err != 0) { - ngx_log_error(NGX_LOG_EMERG, log, err, - "pthread_mutexattr_settype" - "(PTHREAD_MUTEX_ERRORCHECK) failed"); - return NGX_ERROR; - } - - err = pthread_mutex_init(mtx, &attr); - if (err != 0) { - ngx_log_error(NGX_LOG_EMERG, log, err, - "pthread_mutex_init() failed"); - return NGX_ERROR; - } - - err = pthread_mutexattr_destroy(&attr); - if (err != 0) { - ngx_log_error(NGX_LOG_ALERT, log, err, - "pthread_mutexattr_destroy() failed"); - } - - return NGX_OK; -} - - -ngx_int_t -ngx_thread_mutex_destroy(ngx_thread_mutex_t *mtx, ngx_log_t *log) -{ - ngx_err_t err; - - err = pthread_mutex_destroy(mtx); - if (err != 0) { - ngx_log_error(NGX_LOG_ALERT, log, err, - "pthread_mutex_destroy() failed"); - return NGX_ERROR; - } - - return NGX_OK; -} - - -ngx_int_t -ngx_thread_mutex_lock(ngx_thread_mutex_t *mtx, ngx_log_t *log) -{ - ngx_err_t err; - - err = pthread_mutex_lock(mtx); - if (err == 0) { - return NGX_OK; - } - - ngx_log_error(NGX_LOG_ALERT, log, err, "pthread_mutex_lock() failed"); - - return NGX_ERROR; -} - - -ngx_int_t -ngx_thread_mutex_unlock(ngx_thread_mutex_t *mtx, ngx_log_t *log) -{ - ngx_err_t err; - - err = pthread_mutex_unlock(mtx); - -#if 0 - ngx_time_update(); -#endif - - if (err == 0) { - return NGX_OK; - } - - ngx_log_error(NGX_LOG_ALERT, log, err, "pthread_mutex_unlock() failed"); - - return NGX_ERROR; -} |