c++辅助python实现多线程(条件变量)

程序很简单,主要是熟悉一下c++和python的编程,然后那个条件变量的使用花了点时间,主要是以前没用过.

主要用途想以后建立个线程池非阻塞的调用sql.

#include
#include
#include
#include "Python.h"

//加载时初始化和卸载时清理
void __attribute__ ((constructor)) my_init(void);
void my_fini(void) __attribute__((destructor));
#define GIGNAL_BEGIN (SIGUSR1+1)
#define GIGNAL_FINISH (SIGUSR1+2)

pid_t pid;
int value;
int is_begin = 0, is_end = 0;
pthread_mutex_t mutex;
pthread_cond_t cond;
void *func(void *args)
{
int *r = args, i = 0;
printf("in func");
while(1)
{
pthread_mutex_lock(&mutex);
while(!is_begin)
{
pthread_cond_wait(&cond, &mutex);
}
is_begin = 0;
pthread_mutex_unlock(&mutex);
*r = i++;
pthread_mutex_lock(&mutex);
is_end = 1;
pthread_cond_signal(&cond);
pthread_mutex_unlock(&mutex);
}
return (void *)0;
}


void my_init(void)
{
int err;
if((err = pthread_create(&pid, NULL, func, &value)) != 0)
{
printf("errno=%d\n",err);
}
pthread_mutex_init(&mutex, NULL);
return;
}

int increase()
{
pthread_mutex_lock(&mutex);
is_begin = 1;
pthread_cond_signal(&cond);
pthread_mutex_unlock(&mutex);
pthread_mutex_lock(&mutex);
while(!is_end)
{
pthread_cond_wait(&cond, &mutex);
}
is_end = 0;
pthread_mutex_unlock(&mutex);
return value;
}

static PyObject* wrap_increase(PyObject *self, PyObject *args)
{

int result = increase();
//把得到的结果包装成Python对象，并返回

return (PyObject*)Py_BuildValue("i", result);
}

void my_fini(void)
{
pthread_mutex_destroy(&mutex);
return;
}

int add(int arg1, int arg2)
{
return arg1 + arg2;
}

static PyObject* wrap_add(PyObject *self, PyObject *args)
{
//把输入的Python对象转换为C/C++能识别的数据

int arg1, arg2;
if(!PyArg_ParseTuple(args, "ii", &arg1, &arg2))
return NULL;
//调用C/C++函数，得到结果

int result = add(arg1,arg2);
//把得到的结果包装成Python对象，并返回

return (PyObject*)Py_BuildValue("i", result);
}


static PyMethodDef wrap_methods[] ={
{"add", wrap_add, METH_VARARGS, "求和"}, //函数名（调用），函数地址，参数类型，函数说明
{"increase", wrap_increase, METH_VARARGS, "求和"},
{NULL, NULL}
};

//入口看书，init后必须跟模块的名字
void initwrap (void)
{
Py_InitModule("wrap", wrap_methods);
}