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Kernel+LibPthread+LibC: Add a naive futex and use it for pthread_cond_t
This patch implements a simple version of the futex (fast userspace mutex) API in the kernel and uses it to make the pthread_cond_t API's block instead of busily sched_yield(). An arbitrary userspace address is passed to the kernel as a "token" that identifies the futex and you can then FUTEX_WAIT and FUTEX_WAKE that specific userspace address. FUTEX_WAIT corresponds to pthread_cond_wait() and FUTEX_WAKE is used for pthread_cond_signal() and pthread_cond_broadcast(). I'm pretty sure I'm missing something in this implementation, but it's hopefully okay for a start. :^)
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9 changed files with 99 additions and 55 deletions
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@ -44,4 +44,9 @@ int module_unload(const char* name, size_t name_length);
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int profiling_enable(pid_t);
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int profiling_disable(pid_t);
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#define FUTEX_WAIT 1
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#define FUTEX_WAKE 2
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int futex(int32_t* userspace_address, int futex_op, int32_t value, const struct timespec* timeout);
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__END_DECLS
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