Resource allocation process is the smallest unit of the thread is the smallest unit of scheduling
Process must be assigned a separate address space, the new data table, stack and data segments
Follow multi-threaded POSIX thread interface, no longer needs the standard library header files pthread.h c
Connection requires libpthread.a--> gcc filename-lpthread
Create a thread
#include <pthread.h> int pthread_create(pthread_t *tidp, const pthread_attr_t *attr, void *(*start_rtn)(void), void *arg) //tidp Thread ID //attr Thread properties, often empty //start_rtn Thread to perform the function //arg start_rtn Parameters
Example;
#include <stdio.h>
#include <pthread.h>
#include <unistd.h>
void *create(void *arg)
{
int *num;
num=(int *)arg;
printf("create parameter is %d \n",*num);
return (void *)0;
}
int main(int argc ,char *argv[])
{
pthread_t tidp;
int error;
int test=4;
int *attr=&test;
error=pthread_create(&tidp,NULL,create,(void *)attr);
if(error)
{
printf("pthread_create is created is not created ... \n");
return -1;
}
sleep(1);
printf("pthread_create is created ...\n");
return 0;
}
Terminate a thread in the process of any one thread exit or _exit, the process will terminate the thread exits the normal way:
1 From the start the routine returns
2 terminated by another process
3 pthread_exit function that calls
#include <pthread.h> void pthread_exit(void *rval_ptr) // Terminates the calling thread //rval_ptr The thread exits the return value of the pointer
Example:
#include <stdio.h>
#include <pthread.h>
#include <unistd.h>
void *create(void *arg)
{
printf("new thread is created ... \n");
return (void *)8;
}
int main(int argc,char *argv[])
{
pthread_t tid;
int error;
void *temp;
error = pthread_create(&tid, NULL, create, NULL);
printf("main thread!\n");
if( error )
{
printf("thread is not created ... \n");
return -1;
}
error = pthread_join(tid, &temp);
if( error )
{
printf("thread is not exit ... \n");
return -2;
}
printf("thread is exit code %d \n", (int )temp);
return 0;
}
