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使用clone替代fork (#1518)
使用clone替代fork 因为fork子进程有时会导致提前写时复制, 进而影响性能. 而vfork又会引起父进程阻塞 所以使用clone来产生子进程运行ffmpeg
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alexliyu7352
GitHub
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43c5d05d8f
@ -27,9 +27,63 @@
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#include "Util/uv_errno.h"
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#include "Poller/EventPoller.h"
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#include "Process.h"
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#define STACK_SIZE (8192*1024)
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using namespace toolkit;
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using namespace std;
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#ifndef _WIN32
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typedef struct
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{
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const char *cmd_path;
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char **cmd_args;
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const char *log_file;
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} params_t;
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static int /* Start function for cloned child */
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childFunc(params_t *params)
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{
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//取消cpu亲和性设置，防止FFmpeg进程cpu占用率不能超过100%的问题
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setThreadAffinity(-1);
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//子进程关闭core文件生成
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struct rlimit rlim = {0, 0};
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setrlimit(RLIMIT_CORE, &rlim);
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//重定向shell日志至文件
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char log_path[strlen(params->log_file) + 20];
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memset(log_path,0,sizeof(log_path));
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if (strlen(params->log_file) <= 1) {
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//未指定子进程日志文件时，重定向至/dev/null
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snprintf(log_path, sizeof(log_path), "%s", "/dev/null");
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} else {
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snprintf(log_path, sizeof(log_path), "%s.%d", params->log_file, getpid());
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}
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auto fp = File::create_file(params->log_file, "ab");
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if (!fp) {
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fprintf(stderr, "open log file %s failed:%d(%s)\r\n", log_path, get_uv_error(), get_uv_errmsg());
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} else {
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auto log_fd = fileno(fp);
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// dup to stdout and stderr.
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if (dup2(log_fd, STDOUT_FILENO) < 0) {
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fprintf(stderr, "dup2 stdout file %s failed:%d(%s)\r\n", log_path, get_uv_error(), get_uv_errmsg());
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}
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if (dup2(log_fd, STDERR_FILENO) < 0) {
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fprintf(stderr, "dup2 stderr file %s failed:%d(%s)\r\n", log_path, get_uv_error(), get_uv_errmsg());
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}
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// 关闭日志文件
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::fclose(fp);
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}
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fprintf(stderr, "\r\n\r\n#### pid=%d,cmd=%s%s #####\r\n\r\n", getpid(), params->cmd_path, *params->cmd_args);
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// TODO: execv or execvp
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auto ret = execv(params->cmd_path, params->cmd_args);
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if (ret < 0) {
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fprintf(stderr, "clone process failed:%d(%s)\r\n", get_uv_error(), get_uv_errmsg());
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}
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return ret;
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}
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#endif
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void Process::run(const string &cmd, string &log_file_tmp) {
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kill(2000);
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#ifdef _WIN32
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@ -71,8 +125,34 @@ void Process::run(const string &cmd, string &log_file_tmp) {
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WarnL << "start child process fail: " << get_uv_errmsg();
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}
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fclose(fp);
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#elif ((defined(__linux) || defined(__linux__)))
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_process_stack = malloc(STACK_SIZE);
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auto params = split(cmd, " ");
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// memory leak in child process, it's ok.
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char **char_params = new char *[params.size() + 1];
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for (int i = 0; i < (int) params.size(); i++) {
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std::string &p = params[i];
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char_params[i] = (char *) p.data();
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}
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// EOF: NULL
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char_params[params.size()] = NULL;
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params_t cmd_params = {params[0].c_str(), char_params, log_file_tmp.c_str()};
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int clonePid = clone(reinterpret_cast<int (*)(void *)>(&childFunc), (char *)_process_stack + STACK_SIZE, CLONE_FS | SIGCHLD, (void *) (&cmd_params));
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delete[] char_params;
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if (clonePid == -1) {
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WarnL << "clone process failed:" << get_uv_errmsg();
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free(_process_stack);
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throw std::runtime_error(StrPrinter << "fork child process failed,err:" << get_uv_errmsg());
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}
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_pid = clonePid;
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if(log_file_tmp.empty()) {
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InfoL << "start child process " << _pid << ", log file:" << "/dev/null";
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}else {
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InfoL << "start child process " << _pid << ", log file:" << log_file_tmp.c_str() << "." << _pid;
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}
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#else
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_pid = fork();
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_pid = vfork();
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if (_pid < 0) {
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throw std::runtime_error(StrPrinter << "fork child process failed,err:" << get_uv_errmsg());
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}
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@ -91,10 +171,10 @@ void Process::run(const string &cmd, string &log_file_tmp) {
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setrlimit(RLIMIT_CORE, &rlim);
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//在启动子进程时，暂时禁用SIGINT、SIGTERM信号
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signal(SIGINT, SIG_IGN);
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signal(SIGTERM, SIG_IGN);
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signal(SIGSEGV, SIG_IGN);
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signal(SIGABRT, SIG_IGN);
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signal(SIGINT, SIG_DFL);
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signal(SIGTERM, SIG_DFL);
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signal(SIGSEGV, SIG_DFL);
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signal(SIGABRT, SIG_DFL);
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//重定向shell日志至文件
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auto fp = File::create_file(log_file.data(), "ab");
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@ -114,18 +194,6 @@ void Process::run(const string &cmd, string &log_file_tmp) {
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}
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fprintf(stderr, "\r\n\r\n#### pid=%d,cmd=%s #####\r\n\r\n", getpid(), cmd.data());
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#ifndef ANDROID
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//关闭父进程继承的fd
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for (int i = 3; i < getdtablesize(); i++) {
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::close(i);
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}
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#else
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//关闭父进程继承的fd
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for (int i = 3; i < 1024; i++) {
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::close(i);
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}
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#endif
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auto params = split(cmd, " ");
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// memory leak in child process, it's ok.
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char **charpv_params = new char *[params.size() + 1];
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@ -298,6 +366,11 @@ void Process::kill(int max_delay, bool force) {
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CloseHandle(_handle);
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_handle = nullptr;
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}
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#elif ((defined(__linux) || defined(__linux__)))
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if(_process_stack){
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free(_process_stack);
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_process_stack = nullptr;
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}
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#endif
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}
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@ -31,6 +31,7 @@ public:
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private:
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pid_t _pid = -1;
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void *_handle = nullptr;
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void* _process_stack = nullptr;
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int _exit_code = 0;
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};
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