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Posix semaphore source location on Linux

I started to learn the concept of semaphores in the operating system. I am using POSIX semaphores on linux. I've used sem_init (), sem_wait () and sem_post () to initialize, decrement, and increment semaphore variables.

I've seen function declarations defined in the semaphore.h file.

But I couldn't find the source code for these functions. I went through some of the kernel source files but I couldn't find them. Where can I get these source files?

I am using linux 3.6.11-4 kernel.

Thank.

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Unlike the older "SysV IPC" semaphores ( semctl

, semop

etc.), the POSIX semaphore API is not directly implemented in the kernel. Instead, the C library implements it on top of a futex

generic synchronization primitive.



The code you are looking for is in a subdirectory nptl

of the GNU libc source tree. You may also need to search in sysdeps

to find all of these.

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