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Copy pathThread.cpp
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executable file
·133 lines (115 loc) · 2.65 KB
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// @Author Lin Ya
// @Email xxbbb@vip.qq.com
#include "Thread.h"
#include "CurrentThread.h"
#include <memory>
#include <errno.h>
#include <stdio.h>
#include <unistd.h>
#include <sys/prctl.h>
#include <sys/types.h>
#include <linux/unistd.h>
#include <stdint.h>
#include <assert.h>
#include <iostream>
using namespace std;
namespace CurrentThread
{
__thread int t_cachedTid = 0;
__thread char t_tidString[32];
__thread int t_tidStringLength = 6;
__thread const char* t_threadName = "default";
}
pid_t gettid()
{
return static_cast<pid_t>(::syscall(SYS_gettid));
}
void CurrentThread::cacheTid()
{
if (t_cachedTid == 0)
{
t_cachedTid = gettid();
t_tidStringLength = snprintf(t_tidString, sizeof t_tidString, "%5d ", t_cachedTid);
}
}
// 为了在线程中保留name,tid这些数据
struct ThreadData
{
typedef Thread::ThreadFunc ThreadFunc;
ThreadFunc func_;
string name_;
pid_t* tid_;
CountDownLatch* latch_;
ThreadData(const ThreadFunc &func, const string& name, pid_t *tid, CountDownLatch *latch)
: func_(func),
name_(name),
tid_(tid),
latch_(latch)
{ }
void runInThread()
{
*tid_ = CurrentThread::tid();
tid_ = NULL;
latch_->countDown();
latch_ = NULL;
CurrentThread::t_threadName = name_.empty() ? "Thread" : name_.c_str();
prctl(PR_SET_NAME, CurrentThread::t_threadName);
func_();
CurrentThread::t_threadName = "finished";
}
};
void *startThread(void* obj)
{
ThreadData* data = static_cast<ThreadData*>(obj);
data->runInThread();
delete data;
return NULL;
}
Thread::Thread(const ThreadFunc &func, const string &n)
: started_(false),
joined_(false),
pthreadId_(0),
tid_(0),
func_(func),
name_(n),
latch_(1)
{
setDefaultName();
}
Thread::~Thread()
{
if (started_ && !joined_)
pthread_detach(pthreadId_);
}
void Thread::setDefaultName()
{
if (name_.empty())
{
char buf[32];
snprintf(buf, sizeof buf, "Thread");
name_ = buf;
}
}
void Thread::start()
{
assert(!started_);
started_ = true;
ThreadData* data = new ThreadData(func_, name_, &tid_, &latch_);
if (pthread_create(&pthreadId_, NULL, &startThread, data))
{
started_ = false;
delete data;
}
else
{
latch_.wait();
assert(tid_ > 0);
}
}
int Thread::join()
{
assert(started_);
assert(!joined_);
joined_ = true;
return pthread_join(pthreadId_, NULL);
}