forked from Bananymous/banan-os
62 lines
1.1 KiB
C++
62 lines
1.1 KiB
C++
#include <pthread.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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pthread_spinlock_t spinlock;
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void* thread_func(void*)
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{
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printf("[THREAD] locking spinlock\n");
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pthread_spin_lock(&spinlock);
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printf("[THREAD] got spinlock\n");
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sleep(1);
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printf("[THREAD] releasing spinlock\n");
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pthread_spin_unlock(&spinlock);
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int* value = static_cast<int*>(malloc(sizeof(int)));
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if (value == nullptr)
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{
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perror("malloc");
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return nullptr;
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}
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*value = 69;
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printf("[THREAD] exiting with %d\n", *value);
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return value;
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}
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int main(int argc, char** argv)
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{
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pthread_spin_init(&spinlock, 0);
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printf("[MAIN] locking spinlock\n");
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pthread_spin_lock(&spinlock);
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printf("[MAIN] creating thread\n");
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pthread_t thread;
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pthread_create(&thread, nullptr, &thread_func, nullptr);
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sleep(1);
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printf("[MAIN] releasing spinlock\n");
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pthread_spin_unlock(&spinlock);
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printf("[MAIN] joining thread\n");
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void* value;
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pthread_join(thread, &value);
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if (value == nullptr)
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printf("[MAIN] thread returned NULL\n");
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else
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printf("[MAIN] thread returned %d\n", *static_cast<int*>(value));
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return 0;
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}
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