pthread_mutex1: Enable contention on a shared pthread_mutex across pr…#39
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pthread_mutex1: Enable contention on a shared pthread_mutex across pr…#39ivanalgo wants to merge 1 commit into
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…ocesses The original "Contended pthread mutex" test case was unfair when comparing threads and processes, because each process created by fork() used its own copy of the pthread_mutex_t, resulting in no actual contention between processes. To make the test fair and meaningful in both multi-threaded and multi-process modes, this patch modifies the test to allocate a pthread_mutex_t in a shared memory region (mmap), and initializes it with PTHREAD_PROCESS_SHARED so that all processes contend on the same mutex. This change ensures that contention happens on the same mutex object regardless of whether the test is run using threads or processes. Signed-off-by: Yongting Lin <linyongting@gmail.com>
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pthread_mutex1: Enable contention on a shared pthread_mutex across processes
The original "Contended pthread mutex" test case was unfair when comparing
threads and processes, because each process created by fork() used its own
copy of the pthread_mutex_t, resulting in no actual contention between processes.
To make the test fair and meaningful in both multi-threaded and multi-process
modes, this patch modifies the test to allocate a pthread_mutex_t in a shared
memory region (mmap), and initializes it with PTHREAD_PROCESS_SHARED so that
all processes contend on the same mutex.
This change ensures that contention happens on the same mutex object regardless
of whether the test is run using threads or processes.
Signed-off-by: Yongting Lin linyongting@gmail.com