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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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@ -77,7 +77,9 @@ typedef struct __pthread_mutexattr_t {
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} pthread_mutexattr_t;
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typedef struct __pthread_cond_t {
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void* storage;
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int32_t value;
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uint32_t previous;
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int clockid; // clockid_t
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} pthread_cond_t;
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typedef void* pthread_rwlock_t;
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