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Hello, Sometimes pthread_mutex_lock ou pthread_mutex_unlock block. In order to reproduce the problem, I have made a test application (test.c) who always block $ gcc test.c -o test $ ./test thread id=1 after pthread_create 1 after pthread_create 2 thread id=2 thread id=3 after pthread_create 3 after pthread_create 4 thread id=4 thread id=5 after pthread_create 5 thread id=6 after pthread_create 6 after pthread_create 7 The application can create 1,2,3 threads or many more before blocking. -- Thomas
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