@benny_schoen
In Linux, you can make a thread wait for another thread using synchronization mechanisms like condition variables or semaphores. The following steps outline how you can achieve this:
- Include the necessary header files.
- Declare the necessary variables, such as a mutex and a condition variable.
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pthread_mutex_t mutex;
pthread_cond_t condition;
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- Initialize the mutex and condition variable before creating the threads.
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pthread_mutex_init(&mutex, NULL);
pthread_cond_init(&condition, NULL);
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- Create the threads, passing the necessary arguments.
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pthread_t thread1, thread2;
pthread_create(&thread1, NULL, function1, NULL);
pthread_create(&thread2, NULL, function2, NULL);
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- Implement the waiting logic in one of the threads. In this example, thread1 waits for thread2.
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void* function1(void* arg) {
// Perform some work
pthread_mutex_lock(&mutex);
pthread_cond_wait(&condition, &mutex);
pthread_mutex_unlock(&mutex);
return NULL;
}
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- Implement the trigger logic in the other thread. In this example, thread2 signals thread1 to proceed.
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void* function2(void* arg) {
// Perform some work
pthread_mutex_lock(&mutex);
pthread_cond_signal(&condition);
pthread_mutex_unlock(&mutex);
return NULL;
}
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- Wait for the threads to finish executing.
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pthread_join(thread1, NULL);
pthread_join(thread2, NULL);
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- Cleanup and destroy the mutex and condition variable.
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pthread_mutex_destroy(&mutex);
pthread_cond_destroy(&condition);
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By using these synchronization mechanisms, you can ensure that one thread waits for another to reach a certain point before continuing execution.