ngx_int_t
ngx_mutex_trylock(ngx_mutex_t *m)
{
int err;
if (!ngx_threaded) {
return NGX_OK;
}
ngx_log_debug1(NGX_LOG_DEBUG_MUTEX, m->log, 0, "try lock mutex %p", m);
err = pthread_mutex_trylock(&m->mutex);
if (err == NGX_EBUSY) {
return NGX_AGAIN;
}
if (err != 0) {
ngx_log_error(NGX_LOG_ALERT, m->log, err,
"pthread_mutex_trylock(%p) failed", m);
ngx_abort();
}
ngx_log_debug1(NGX_LOG_DEBUG_MUTEX, m->log, 0, "mutex %p is locked", m);
return NGX_OK;
}
void
ngx_debug_point(void)
{
ngx_core_conf_t *ccf;
ccf = (ngx_core_conf_t *) ngx_get_conf(ngx_cycle->conf_ctx,
ngx_core_module);
switch (ccf->debug_points)
{
case NGX_DEBUG_POINTS_STOP:
raise(SIGSTOP);
break;
case NGX_DEBUG_POINTS_ABORT:
ngx_abort();
}
}
void ngx_str_helper(ngx_str_t *str, ngx_str_op op)
{
static char backup;
switch (op) {
case ngx_str_push:
backup = str->data[str->len];
str->data[str->len] = 0;
break;
case ngx_str_pop:
str->data[str->len] = backup;
break;
default:
ngx_abort();
}
}
void
ngx_debug_point(void)
{//让自己停止，通知父进程
ngx_core_conf_t *ccf;
ccf = (ngx_core_conf_t *) ngx_get_conf(ngx_cycle->conf_ctx,
ngx_core_module);
switch (ccf->debug_points) {
case NGX_DEBUG_POINTS_STOP:
raise(SIGSTOP);
//SIGSTOP 停止(stopped)进程的执行. 注意它和terminate以及interrupt的区别:
//该进程还未结束, 只是暂停执行. 本信号不能被阻塞, 处理或忽略.
break;
case NGX_DEBUG_POINTS_ABORT:
ngx_abort();
}
}
void
ngx_mutex_lock(ngx_mutex_t *m)
{//多线程用的互斥锁
int err;
if (!ngx_threaded) {
return;
}
ngx_log_debug1(NGX_LOG_DEBUG_MUTEX, m->log, 0, "lock mutex %p", m);
err = pthread_mutex_lock(&m->mutex);
if (err != 0) {
ngx_log_error(NGX_LOG_ALERT, m->log, err, "pthread_mutex_lock(%p) failed", m);
ngx_abort();
}
ngx_log_debug1(NGX_LOG_DEBUG_MUTEX, m->log, 0, "mutex %p is locked", m);
return;
}
