static char *
ngx_kqueue_init_conf(ngx_cycle_t *cycle, void *conf)
{
ngx_kqueue_conf_t *kcf = conf;
ngx_conf_init_uint_value(kcf->changes, 512);
ngx_conf_init_uint_value(kcf->events, 512);
return NGX_CONF_OK;
}
static char *
ngx_epoll_init_conf(ngx_cycle_t *cycle, void *conf)
{
ngx_epoll_conf_t *epcf = conf;
ngx_conf_init_uint_value(epcf->events, 512);
ngx_conf_init_uint_value(epcf->aio_requests, 32);
return NGX_CONF_OK;
}
static char *
ngx_devpoll_init_conf(ngx_cycle_t *cycle, void *conf)
{
ngx_devpoll_conf_t *dpcf = conf;
ngx_conf_init_uint_value(dpcf->changes, 32);
ngx_conf_init_uint_value(dpcf->events, 32);
return NGX_CONF_OK;
}
static char *
ngx_rtsig_init_conf(ngx_cycle_t *cycle, void *conf)
{
ngx_rtsig_conf_t *rtscf = conf;
/* LinuxThreads use the first 3 RT signals */
ngx_conf_init_uint_value(rtscf->signo, SIGRTMIN + 10);
ngx_conf_init_uint_value(rtscf->overflow_events, 16);
ngx_conf_init_uint_value(rtscf->overflow_test, 32);
ngx_conf_init_uint_value(rtscf->overflow_threshold, 10);
return NGX_CONF_OK;
}
static char *
ngx_eventport_init_conf(ngx_cycle_t *cycle, void *conf)
{
ngx_eventport_conf_t *epcf = conf;
ngx_conf_init_uint_value(epcf->events, 32);
return NGX_CONF_OK;
}
static char *
ngx_stream_core_init_main_conf(ngx_conf_t *cf, void *conf)
{
ngx_stream_core_main_conf_t *cmcf = conf;
ngx_conf_init_uint_value(cmcf->variables_hash_max_size, 1024);
ngx_conf_init_uint_value(cmcf->variables_hash_bucket_size, 64);
cmcf->variables_hash_bucket_size =
ngx_align(cmcf->variables_hash_bucket_size, ngx_cacheline_size);
if (cmcf->ncaptures) {
cmcf->ncaptures = (cmcf->ncaptures + 1) * 3;
}
return NGX_CONF_OK;
}
static char *
ngx_pool_context_init_conf(ngx_cycle_t *cycle, void *conf)
{
ngx_pool_context_conf_t *pcf = conf;
ngx_conf_init_uint_value(pcf->size, cycle->connection_n);
ngx_pool_context_hash_size = pcf->size;
ngx_pool_context_hash = ngx_pcalloc(cycle->pool, sizeof(ngx_pool_context_node_t *) * ngx_pool_context_hash_size);
if (ngx_pool_context_hash == NULL) {
return NGX_CONF_ERROR;
}
return NGX_CONF_OK;
}
static ngx_int_t
ngx_http_upstream_init_keepalive(ngx_conf_t *cf,
ngx_http_upstream_srv_conf_t *us)
{
ngx_uint_t i;
ngx_http_upstream_keepalive_srv_conf_t *kcf;
ngx_http_upstream_keepalive_cache_t *cached;
ngx_log_debug0(NGX_LOG_DEBUG_HTTP, cf->log, 0,
"init keepalive");
kcf = ngx_http_conf_upstream_srv_conf(us,
ngx_http_upstream_keepalive_module);
ngx_conf_init_msec_value(kcf->timeout, 60000);
ngx_conf_init_uint_value(kcf->requests, 100);
if (kcf->original_init_upstream(cf, us) != NGX_OK) {
return NGX_ERROR;
}
kcf->original_init_peer = us->peer.init;
us->peer.init = ngx_http_upstream_init_keepalive_peer;
/* allocate cache items and add to free queue */
cached = ngx_pcalloc(cf->pool,
sizeof(ngx_http_upstream_keepalive_cache_t) * kcf->max_cached);
if (cached == NULL) {
return NGX_ERROR;
}
ngx_queue_init(&kcf->cache);
ngx_queue_init(&kcf->free);
for (i = 0; i < kcf->max_cached; i++) {
ngx_queue_insert_head(&kcf->free, &cached[i].queue);
cached[i].conf = kcf;
}
return NGX_OK;
}
static char *
ngx_event_core_init_conf(ngx_cycle_t *cycle, void *conf)
{
ngx_event_conf_t *ecf = conf;
#if (NGX_HAVE_EPOLL) && !(NGX_TEST_BUILD_EPOLL)
int fd;
#endif
#if (NGX_HAVE_RTSIG)
ngx_uint_t rtsig;
ngx_core_conf_t *ccf;
#endif
ngx_int_t i;
ngx_module_t *module;
ngx_event_module_t *event_module;
module = NULL;
#if (NGX_HAVE_EPOLL) && !(NGX_TEST_BUILD_EPOLL)
fd = epoll_create(100);
if (fd != -1) {
(void) close(fd);
module = &ngx_epoll_module;
} else if (ngx_errno != NGX_ENOSYS) {
module = &ngx_epoll_module;
}
#endif
#if (NGX_HAVE_RTSIG)
if (module == NULL) {
module = &ngx_rtsig_module;
rtsig = 1;
} else {
rtsig = 0;
}
#endif
#if (NGX_HAVE_DEVPOLL)
module = &ngx_devpoll_module;
#endif
#if (NGX_HAVE_KQUEUE)
module = &ngx_kqueue_module;
#endif
#if (NGX_HAVE_SELECT)
if (module == NULL) {
module = &ngx_select_module;
}
#endif
if (module == NULL) {
for (i = 0; ngx_modules[i]; i++) {
if (ngx_modules[i]->type != NGX_EVENT_MODULE) {
continue;
}
event_module = ngx_modules[i]->ctx;
if (ngx_strcmp(event_module->name->data, event_core_name.data) == 0)
{
continue;
}
module = ngx_modules[i];
break;
}
}
if (module == NULL) {
ngx_log_error(NGX_LOG_EMERG, cycle->log, 0, "no events module found");
return NGX_CONF_ERROR;
}
ngx_conf_init_uint_value(ecf->connections, DEFAULT_CONNECTIONS);
cycle->connection_n = ecf->connections;
ngx_conf_init_uint_value(ecf->use, module->ctx_index);
event_module = module->ctx;
ngx_conf_init_ptr_value(ecf->name, event_module->name->data);
ngx_conf_init_value(ecf->multi_accept, 0);
ngx_conf_init_value(ecf->accept_mutex, 1);
ngx_conf_init_msec_value(ecf->accept_mutex_delay, 500);
#if (NGX_HAVE_RTSIG)
if (!rtsig) {
return NGX_CONF_OK;
}
if (ecf->accept_mutex) {
return NGX_CONF_OK;
}
ccf = (ngx_core_conf_t *) ngx_get_conf(cycle->conf_ctx, ngx_core_module);
if (ccf->worker_processes == 0) {
return NGX_CONF_OK;
}
ngx_log_error(NGX_LOG_EMERG, cycle->log, 0,
"the \"rtsig\" method requires \"accept_mutex\" to be on");
return NGX_CONF_ERROR;
#else
return NGX_CONF_OK;
#endif
}
// 所有模块配置解析完毕后，对配置进行初始化
// 如果有的指令没有写，就要给正确的默认值
// 模块默认使用epoll
// 默认不接受多个请求，也就是一次只accept一个连接
// 默认使用负载均衡锁
static char *
ngx_event_core_init_conf(ngx_cycle_t *cycle, void *conf)
{
ngx_event_conf_t *ecf = conf;
#if (NGX_HAVE_EPOLL) && !(NGX_TEST_BUILD_EPOLL)
int fd;
#endif
// rtsig在nginx 1.9.x已经删除
ngx_int_t i;
ngx_module_t *module;
ngx_event_module_t *event_module;
module = NULL;
// 测试epoll是否可用
#if (NGX_HAVE_EPOLL) && !(NGX_TEST_BUILD_EPOLL)
fd = epoll_create(100);
// epoll调用可用，那么模块默认使用epoll
if (fd != -1) {
(void) close(fd);
// epoll调用可用，那么模块默认使用epoll
module = &ngx_epoll_module;
} else if (ngx_errno != NGX_ENOSYS) {
// epoll调用可用，那么模块默认使用epoll
module = &ngx_epoll_module;
}
#endif
// rtsig在nginx 1.9.x已经删除
#if (NGX_HAVE_DEVPOLL) && !(NGX_TEST_BUILD_DEVPOLL)
module = &ngx_devpoll_module;
#endif
#if (NGX_HAVE_KQUEUE)
module = &ngx_kqueue_module;
#endif
// 如果epoll不可用，那么默认使用select
#if (NGX_HAVE_SELECT)
if (module == NULL) {
module = &ngx_select_module;
}
#endif
// 还没有决定默认的事件模型
if (module == NULL) {
// 遍历所有的事件模块
for (i = 0; cycle->modules[i]; i++) {
if (cycle->modules[i]->type != NGX_EVENT_MODULE) {
continue;
}
event_module = cycle->modules[i]->ctx;
// 跳过event_core模块
if (ngx_strcmp(event_module->name->data, event_core_name.data) == 0)
{
continue;
}
// 使用数组里的第一个事件模块
module = cycle->modules[i];
break;
}
}
// 最后还没有决定默认的事件模型，出错
if (module == NULL) {
ngx_log_error(NGX_LOG_EMERG, cycle->log, 0, "no events module found");
return NGX_CONF_ERROR;
}
// nginx每个进程可使用的连接数量，即cycle里的连接池大小
ngx_conf_init_uint_value(ecf->connections, DEFAULT_CONNECTIONS);
// 如果没有使用worker_connections指令，在这里设置
cycle->connection_n = ecf->connections;
// 决定使用的事件模型,之前的module只作为默认值，如果已经使用了use则无效
ngx_conf_init_uint_value(ecf->use, module->ctx_index);
// 初始化使用的事件模块的名字
event_module = module->ctx;
ngx_conf_init_ptr_value(ecf->name, event_module->name->data);
// 默认不接受多个请求，也就是一次只accept一个连接
ngx_conf_init_value(ecf->multi_accept, 0);
// 默认使用负载均衡锁
ngx_conf_init_value(ecf->accept_mutex, 1);
// 默认负载均衡锁的等待时间是500毫秒
ngx_conf_init_msec_value(ecf->accept_mutex_delay, 500);
return NGX_CONF_OK;
}
static char *
ngx_event_core_init_conf(ngx_cycle_t *cycle, void *conf)
{
ngx_event_conf_t *ecf = conf;
#if (NGX_HAVE_EPOLL) && !(NGX_TEST_BUILD_EPOLL)
int fd;
#endif
ngx_int_t i;
ngx_module_t *module;
ngx_event_module_t *event_module;
module = NULL;
#if (NGX_HAVE_EPOLL) && !(NGX_TEST_BUILD_EPOLL)
fd = epoll_create(100);
if (fd != -1) {
(void) close(fd);
module = &ngx_epoll_module;
} else if (ngx_errno != NGX_ENOSYS) {
module = &ngx_epoll_module;
}
#endif
#if (NGX_HAVE_DEVPOLL)
module = &ngx_devpoll_module;
#endif
#if (NGX_HAVE_KQUEUE)
module = &ngx_kqueue_module;
#endif
#if (NGX_HAVE_SELECT)
if (module == NULL) {
module = &ngx_select_module;
}
#endif
//ngx_event_core_module后的第一个NGX_EVENT_MODULE也就是ngx_epoll_module默认作为第一个event模块
if (module == NULL) {
for (i = 0; ngx_modules[i]; i++) {
if (ngx_modules[i]->type != NGX_EVENT_MODULE) {
continue;
}
event_module = ngx_modules[i]->ctx;
if (ngx_strcmp(event_module->name->data, event_core_name.data) == 0) //不能为ngx_event_core_module
{
continue;
}
module = ngx_modules[i];
break;
}
}
if (module == NULL) {
ngx_log_error(NGX_LOG_EMERG, cycle->log, 0, "no events module found");
return NGX_CONF_ERROR;
}
ngx_conf_init_uint_value(ecf->connections, DEFAULT_CONNECTIONS);
cycle->connection_n = ecf->connections;
ngx_conf_init_uint_value(ecf->use, module->ctx_index);
event_module = module->ctx;
ngx_conf_init_ptr_value(ecf->name, event_module->name->data);
ngx_conf_init_value(ecf->multi_accept, 0);
ngx_conf_init_value(ecf->accept_mutex, 1);
ngx_conf_init_msec_value(ecf->accept_mutex_delay, 500);
return NGX_CONF_OK;
}