// 在nginx.c的main()调用
// 初始化ngx_os_io结构体，设置基本的收发函数
// 基本的页大小,ngx_pagesize = getpagesize()
// 初始化随机数
// 实际工作在ngx_linux_init.c的ngx_os_specific_init()完成
// 关键操作ngx_os_io = ngx_linux_io;设置为linux的接口函数
ngx_int_t
ngx_os_init(ngx_log_t *log)
{
ngx_uint_t n;
#if (NGX_HAVE_OS_SPECIFIC_INIT)
// in ngx_linux_init.c
// 初始化ngx_os_io结构体，设置为linux的收发函数
if (ngx_os_specific_init(log) != NGX_OK) {
return NGX_ERROR;
}
#endif
if (ngx_init_setproctitle(log) != NGX_OK) {
return NGX_ERROR;
}
// 基本的页大小,ngx_pagesize = getpagesize()
ngx_pagesize = getpagesize();
// 宏定义为64
// 然后由ngx_cpuinfo（ngx_cpuinfo.c）来探测
ngx_cacheline_size = NGX_CPU_CACHE_LINE;
for (n = ngx_pagesize; n >>= 1; ngx_pagesize_shift++) { /* void */ }
#if (NGX_HAVE_SC_NPROCESSORS_ONLN)
if (ngx_ncpu == 0) {
ngx_ncpu = sysconf(_SC_NPROCESSORS_ONLN);
}
#endif
if (ngx_ncpu < 1) {
ngx_ncpu = 1;
}
ngx_cpuinfo();
// 最多描述符数量，ngx_max_sockets
if (getrlimit(RLIMIT_NOFILE, &rlmt) == -1) {
ngx_log_error(NGX_LOG_ALERT, log, errno,
"getrlimit(RLIMIT_NOFILE) failed");
return NGX_ERROR;
}
ngx_max_sockets = (ngx_int_t) rlmt.rlim_cur;
// 在接受连接时使用accept4调用
#if (NGX_HAVE_INHERITED_NONBLOCK || NGX_HAVE_ACCEPT4)
ngx_inherited_nonblocking = 1;
#else
ngx_inherited_nonblocking = 0;
#endif
srandom(ngx_time());
return NGX_OK;
}
/* 和操作系统相关的初始化 */
ngx_int_t
ngx_os_init(ngx_log_t *log)
{
ngx_uint_t n;
#if (NGX_HAVE_OS_SPECIFIC_INIT)
/* 操作系统的特殊初始化，如ngx_os_io等等的初始化
* 注意该函数的具体实现在不同平台上进行./configure时，就在
* Makefile文件中指定了
*/
if (ngx_os_specific_init(log) != NGX_OK) {
return NGX_ERROR;
}
#endif
if (ngx_init_setproctitle(log) != NGX_OK) {
return NGX_ERROR;
}
ngx_pagesize = getpagesize();
ngx_cacheline_size = NGX_CPU_CACHE_LINE;
for (n = ngx_pagesize; n >>= 1; ngx_pagesize_shift++) { /* void */ }
#if (NGX_HAVE_SC_NPROCESSORS_ONLN)
if (ngx_ncpu == 0) {
ngx_ncpu = sysconf(_SC_NPROCESSORS_ONLN);
}
#endif
if (ngx_ncpu < 1) {
ngx_ncpu = 1;
}
ngx_cpuinfo();
if (getrlimit(RLIMIT_NOFILE, &rlmt) == -1) {
ngx_log_error(NGX_LOG_ALERT, log, errno,
"getrlimit(RLIMIT_NOFILE) failed");
return NGX_ERROR;
}
ngx_max_sockets = (ngx_int_t) rlmt.rlim_cur;
#if (NGX_HAVE_INHERITED_NONBLOCK || NGX_HAVE_ACCEPT4)
ngx_inherited_nonblocking = 1;
#else
ngx_inherited_nonblocking = 0;
#endif
srandom(ngx_time());
return NGX_OK;
}
ngx_int_t
ngx_os_init(ngx_log_t *log)
{
ngx_time_t *tp;
ngx_uint_t n;
#if (NGX_HAVE_OS_SPECIFIC_INIT)
if (ngx_os_specific_init(log) != NGX_OK) {
return NGX_ERROR;
}
#endif
if (ngx_init_setproctitle(log) != NGX_OK) {
return NGX_ERROR;
}
ngx_pagesize = getpagesize();
ngx_cacheline_size = NGX_CPU_CACHE_LINE;
for (n = ngx_pagesize; n >>= 1; ngx_pagesize_shift++) { /* void */ }
#if (NGX_HAVE_SC_NPROCESSORS_ONLN)
if (ngx_ncpu == 0) {
ngx_ncpu = sysconf(_SC_NPROCESSORS_ONLN);
}
#endif
if (ngx_ncpu < 1) {
ngx_ncpu = 1;
}
ngx_cpuinfo();
if (getrlimit(RLIMIT_NOFILE, &rlmt) == -1) {
ngx_log_error(NGX_LOG_ALERT, log, errno,
"getrlimit(RLIMIT_NOFILE) failed");
return NGX_ERROR;
}
ngx_max_sockets = (ngx_int_t) rlmt.rlim_cur;
#if (NGX_HAVE_INHERITED_NONBLOCK || NGX_HAVE_ACCEPT4)
ngx_inherited_nonblocking = 1;
#else
ngx_inherited_nonblocking = 0;
#endif
tp = ngx_timeofday();
srandom(((unsigned) ngx_pid << 16) ^ tp->sec ^ tp->msec);
return NGX_OK;
}
ngx_int_t
ngx_os_init(ngx_log_t *log)
{
ngx_uint_t n;
#if (NGX_HAVE_OS_SPECIFIC_INIT)
// 获取系统信息
if (ngx_os_specific_init(log) != NGX_OK) {
return NGX_ERROR;
}
#endif
ngx_init_setproctitle(log);
// 获取当前系统的页面大小
ngx_pagesize = getpagesize();
ngx_cacheline_size = NGX_CPU_CACHE_LINE;
for (n = ngx_pagesize; n >>= 1; ngx_pagesize_shift++) { /* void */ }
#if (NGX_HAVE_SC_NPROCESSORS_ONLN)
if (ngx_ncpu == 0) {
// 获取CPU数目
ngx_ncpu = sysconf(_SC_NPROCESSORS_ONLN);
}
#endif
if (ngx_ncpu < 1) {
ngx_ncpu = 1;
}
// 获取ngx_cacheline_size大小
ngx_cpuinfo();
if (getrlimit(RLIMIT_NOFILE, &rlmt) == -1) {
ngx_log_error(NGX_LOG_ALERT, log, errno,
"getrlimit(RLIMIT_NOFILE) failed)");
return NGX_ERROR;
}
// 获取socket句柄的最大数量限制
ngx_max_sockets = (ngx_int_t) rlmt.rlim_cur;
#if (NGX_HAVE_INHERITED_NONBLOCK || NGX_HAVE_ACCEPT4)
ngx_inherited_nonblocking = 1;
#else
ngx_inherited_nonblocking = 0;
#endif
// 把时间作为随机数种子
srandom(ngx_time());
return NGX_OK;
}
ngx_int_t
ngx_os_init(ngx_log_t *log)
{
ngx_uint_t n;
#if (NGX_HAVE_OS_SPECIFIC_INIT)
if (ngx_os_specific_init(log) != NGX_OK) { //获取系统版本等信息
return NGX_ERROR;
}
#endif
if (ngx_init_setproctitle(log) != NGX_OK) { //保存环境变量，跟设置进程名有关
return NGX_ERROR;
}
ngx_pagesize = getpagesize(); //获取系统内粗pagesize
ngx_cacheline_size = NGX_CPU_CACHE_LINE; //获取cacheline size
for (n = ngx_pagesize; n >>= 1; ngx_pagesize_shift++) { /* void */ }
#if (NGX_HAVE_SC_NPROCESSORS_ONLN)
if (ngx_ncpu == 0) {
ngx_ncpu = sysconf(_SC_NPROCESSORS_ONLN);//获取CPU核数
}
#endif
if (ngx_ncpu < 1) {
ngx_ncpu = 1;
}
ngx_cpuinfo(); //获取CPU类型，根据CPU类型设置ngx_cacheline_size
if (getrlimit(RLIMIT_NOFILE, &rlmt) == -1) {
ngx_log_error(NGX_LOG_ALERT, log, errno,
"getrlimit(RLIMIT_NOFILE) failed)");
return NGX_ERROR;
}
ngx_max_sockets = (ngx_int_t) rlmt.rlim_cur; //获取当前系统设置每个进程能打开文件的个数
#if (NGX_HAVE_INHERITED_NONBLOCK || NGX_HAVE_ACCEPT4)
ngx_inherited_nonblocking = 1;
#else
ngx_inherited_nonblocking = 0;
#endif
srandom(ngx_time()); //初始化随机数
return NGX_OK;
}
int main(int argc, char** argv)
{
ngx_init_setproctitle(argc, argv);
FrameworkOptions option;
option.home_dir = "./";
option.manager_routine_period = 5000;
//option.process_routine_period = 1000;
//option.service_timeout_count_limit = 5;
MyManagerProcess manager(option);
MyServiceProcessFactory factory;
MyDispatcherProcessFactory disf;
manager.RegisterServiceProcessFactory(&factory);
manager.RegisterServiceProcessFactory(&disf);
manager.Start();
}
/* 初始化系统相关变量,如内存页面大小ngx_pagesize,ngx_cacheline_size,
最大连接数ngx_max_sockets等 */
ngx_int_t
ngx_os_init(ngx_log_t *log)
{
ngx_uint_t n;
#if (NGX_HAVE_OS_SPECIFIC_INIT)
if (ngx_os_specific_init(log) != NGX_OK) {
return NGX_ERROR;
}
#endif
ngx_init_setproctitle(log);
/** 该函数为glibc的库函数,由系统调用实现,返回内核中的PAGE_SIZE,该值依赖体系结构*/
ngx_pagesize = getpagesize();
ngx_cacheline_size = NGX_CPU_CACHE_LINE;
for (n = ngx_pagesize; n >>= 1; ngx_pagesize_shift++) { /* void */ }
#if (NGX_HAVE_SC_NPROCESSORS_ONLN)
if (ngx_ncpu == 0) {
ngx_ncpu = sysconf(_SC_NPROCESSORS_ONLN);
}
#endif
if (ngx_ncpu < 1) {
ngx_ncpu = 1;
}
ngx_cpuinfo();
if (getrlimit(RLIMIT_NOFILE, &rlmt) == -1) {
ngx_log_error(NGX_LOG_ALERT, log, errno,
"getrlimit(RLIMIT_NOFILE) failed)");
return NGX_ERROR;
}
ngx_max_sockets = (ngx_int_t) rlmt.rlim_cur;
#if (NGX_HAVE_INHERITED_NONBLOCK || NGX_HAVE_ACCEPT4)
ngx_inherited_nonblocking = 1;
#else
ngx_inherited_nonblocking = 0;
#endif
srandom(ngx_time());
return NGX_OK;
}
ngx_int_t
ngx_os_init(ngx_log_t *log)
{
ngx_uint_t n;
#if (NGX_HAVE_OS_SPECIFIC_INIT)
if (ngx_os_specific_init(log) != NGX_OK) {
return NGX_ERROR;
}
#endif
ngx_init_setproctitle(log);
ngx_pagesize = getpagesize();
ngx_cacheline_size = NGX_CPU_CACHE_LINE;
n = ngx_pagesize;
for (n = ngx_pagesize; n >>= 1; ngx_pagesize_shift++) { /* void */ }
if (ngx_ncpu == 0) {
ngx_ncpu = 1;
}
ngx_cpuinfo();
if (getrlimit(RLIMIT_NOFILE, &rlmt) == -1) {
ngx_log_error(NGX_LOG_ALERT, log, errno,
"getrlimit(RLIMIT_NOFILE) failed)");
return NGX_ERROR;
}
ngx_max_sockets = (ngx_int_t) rlmt.rlim_cur;
#if (NGX_HAVE_INHERITED_NONBLOCK)
ngx_inherited_nonblocking = 1;
#else
ngx_inherited_nonblocking = 0;
#endif
srandom(ngx_time());
return NGX_OK;
}
/**
* @param [in] log 日志对象
* @return int NGX_OK|NGX_ERROR
*
* 初始化系统相关变量
* 如内存页面大小ngx_pagesize ngx_cacheline_size ngx_max_sockets等
*
* \file ngx_os.h 申明原型
*/
ngx_int_t
ngx_os_init(ngx_log_t *log)
{
ngx_uint_t n;
#if (NGX_HAVE_OS_SPECIFIC_INIT)
/**
* \file ngx_linux_init.c
* OS指定的初始化：初始化内核名称和其它信息，设置全局变量ngx_os_io，后续用于I/O操作基础（包括网络I/O）
*/
if (ngx_os_specific_init(log) != NGX_OK) {
return NGX_ERROR;
}
#endif
/**
* \file ngx_setproctitle.h|c
* 移动**environ到堆上，为设置进程标题做准备
*/
if (ngx_init_setproctitle(log) != NGX_OK) {
return NGX_ERROR;
}
/**
* \file ngx_alloc.h|c
* os页大小 x86为4096
*/
ngx_pagesize = getpagesize(); //os页大小 x86为4096
/**
* \file ../../../objs/ngx_auto_config.h
* #define NGX_CPU_CACHE_LINE 64
* 主要用于内存池对齐分配。即本机cpu的cache line为64，内存池起始地址也要是64的倍数
*/
ngx_cacheline_size = NGX_CPU_CACHE_LINE;
//slab用到，计算要多少个cache line填满一页 2^12=4096 ngx_pagesize_shift=12
for (n = ngx_pagesize; n >>= 1; ngx_pagesize_shift++) { /* void */ }
#if (NGX_HAVE_SC_NPROCESSORS_ONLN)
if (ngx_ncpu == 0) {
ngx_ncpu = sysconf(_SC_NPROCESSORS_ONLN); //cpu实际个数，配置文件worker_processes
}
#endif
if (ngx_ncpu < 1) {
ngx_ncpu = 1;
}
/**
* \file ../../core/cpuinfo.c
* 调用汇编代码，获取cpu信息，主要用于根据实际cpu信息设置ngx_cacheline_size的值
*/
ngx_cpuinfo();
if (getrlimit(RLIMIT_NOFILE, &rlmt) == -1) { //进程可打开最大文件描述符上限
ngx_log_error(NGX_LOG_ALERT, log, errno,
"getrlimit(RLIMIT_NOFILE) failed");
return NGX_ERROR;
}
ngx_max_sockets = (ngx_int_t) rlmt.rlim_cur; //打开socket描述符最大数量
//socket是否可阻塞设置开关
#if (NGX_HAVE_INHERITED_NONBLOCK || NGX_HAVE_ACCEPT4)
ngx_inherited_nonblocking = 1;
#else
ngx_inherited_nonblocking = 0; //TODO 我的系统为0？
#endif
srandom(ngx_time()); //设置random函数的种子
return NGX_OK;
}
