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LibPthread: Implement condition variables

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This feels like a pretty naive implementation, but I think it can work.
Basically each waiter creates an object on its stack that is then
added to a linked list inside by the pthread_cond_t.

Signalling is then done by walking the list and unsetting the "waiting"
flag on as many of the waiters as you like.
This commit is contained in:
Andreas Kling 2019-12-07 14:24:09 +01:00
parent db2bfe14e9
commit cc1ef6dadb
3 changed files with 109 additions and 2 deletions
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3
Libraries/LibPthread/pthread.h
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@ -4,6 +4,7 @@
#include <stdint.h>
#include <sys/cdefs.h>
#include <sys/types.h>
#include <time.h>
__BEGIN_DECLS
@ -56,6 +57,8 @@ int pthread_cond_broadcast(pthread_cond_t*);
int pthread_cond_init(pthread_cond_t*, const pthread_condattr_t*);
int pthread_cond_signal(pthread_cond_t*);
int pthread_cond_wait(pthread_cond_t*, pthread_mutex_t*);
int pthread_condattr_init(pthread_condattr_t*);
int pthread_condattr_setclock(pthread_condattr_t*, clockid_t);
int pthread_condattr_destroy(pthread_condattr_t*);
int pthread_cancel(pthread_t);
int pthread_cond_destroy(pthread_cond_t*);