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pthread_equal()函數(shù)用于檢查兩個(gè)線程是否相等。它返回0或非零值。對(duì)于相等的線程，它將返回非零值，否則返回0。該函數(shù)的語(yǔ)法如下：

int pthread_equal (pthread_t th1, pthread_t th2);

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現(xiàn)在讓我們看看 pthread_equal() 的實(shí)際作用。第一種情況，我們會(huì)檢查自線程來(lái)檢查結(jié)果。

示例

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/types.h>
#include <pthread.h>
pthread_t sample_thread;
void* my_thread_function(void* p) {
   if (pthread_equal(sample_thread, pthread_self())) { //pthread_self will return current thread id
      printf("Threads are equal
");
   } else {
      printf("Threads are not equal
");
   }
}
main() {
   pthread_t th1;
   sample_thread = th1; //assign the thread th1 to another thread object
   pthread_create(&th1, NULL, my_thread_function, NULL); //create a thread using my thread function
   pthread_join(th1, NULL); //wait for joining the thread with the main thread
}

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輸出

Threads are equal

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現(xiàn)在，如果我們?cè)趦蓚€(gè)不同的線程之間進(jìn)行比較，我們將看到結(jié)果。

示例

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/types.h>
#include <pthread.h>
pthread_t sample_thread;
void* my_thread_function1(void* ptr) {
   sample_thread = pthread_self(); //assign the id of the thread 1
}
void* my_thread_function2(void* p) {
   if (pthread_equal(sample_thread, pthread_self())) { //pthread_self will return current thread id
      printf("Threads are equal
");
   } else {
      printf("Threads are not equal
");
   }
}

main() {
   pthread_t th1, th2;
   pthread_create(&th1, NULL, my_thread_function1, NULL); //create a thread using my_thread_function1
   pthread_create(&th1, NULL, my_thread_function2, NULL); //create a thread using my_thread_function2
   pthread_join(th1, NULL); //wait for joining the thread with the main thread
   pthread_join(th2, NULL);
}

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輸出

Threads are not equal

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以上就是在C語(yǔ)言中，pthread_equal()函數(shù)用于比較兩個(gè)線程ID是否相等的詳細(xì)內(nèi)容，更多請(qǐng)關(guān)注www.xfxf.net其它相關(guān)文章！