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# A Posix Threads (pthreads) wrapper
use <pthread.h>
struct pthread_mutex_t(; extern, opaque)
func new(->@pthread_mutex_t)
return C_code : @pthread_mutex_t(
pthread_mutex_t *mutex = GC_MALLOC(sizeof(pthread_mutex_t));
pthread_mutex_init(mutex, NULL);
GC_register_finalizer(mutex, (void*)pthread_mutex_destroy, NULL, NULL, NULL);
mutex
)
func lock(m:&pthread_mutex_t)
fail("Failed to lock mutex") unless C_code:Int32(pthread_mutex_lock(@m)) == 0
func unlock(m:&pthread_mutex_t)
fail("Failed to unlock mutex") unless C_code:Int32(pthread_mutex_unlock(@m)) == 0
struct pthread_cond_t(; extern, opaque)
func new(->@pthread_cond_t)
return C_code : @pthread_cond_t(
pthread_cond_t *cond = GC_MALLOC(sizeof(pthread_cond_t));
pthread_cond_init(cond, NULL);
GC_register_finalizer(cond, (void*)pthread_cond_destroy, NULL, NULL, NULL);
cond
)
func wait(cond:&pthread_cond_t, mutex:&pthread_mutex_t)
fail("Failed to wait on condition") unless C_code:Int32(pthread_cond_wait(@cond, @mutex)) == 0
func signal(cond:&pthread_cond_t)
fail("Failed to signal pthread_cond_t") unless C_code:Int32(pthread_cond_signal(@cond)) == 0
func broadcast(cond:&pthread_cond_t)
fail("Failed to broadcast pthread_cond_t") unless C_code:Int32(pthread_cond_broadcast(@cond)) == 0
struct pthread_rwlock_t(; extern, opaque)
func new(->@pthread_rwlock_t)
return C_code : @pthread_rwlock_t (
pthread_rwlock_t *lock = GC_MALLOC(sizeof(pthread_rwlock_t));
pthread_rwlock_init(lock, NULL);
GC_register_finalizer(lock, (void*)pthread_rwlock_destroy, NULL, NULL, NULL);
lock
)
func read_lock(lock:&pthread_rwlock_t)
C_code { pthread_rwlock_rdlock(@lock); }
func write_lock(lock:&pthread_rwlock_t)
C_code { pthread_rwlock_wrlock(@lock); }
func unlock(lock:&pthread_rwlock_t)
C_code { pthread_rwlock_unlock(@lock); }
struct pthread_t(; extern, opaque)
func new(fn:func() -> @pthread_t)
return C_code:@pthread_t(
pthread_t *thread = GC_MALLOC(sizeof(pthread_t));
pthread_create(thread, NULL, @fn.fn, @fn.userdata);
thread
)
func join(p:pthread_t) C_code { pthread_join(@p, NULL); }
func cancel(p:pthread_t) C_code { pthread_cancel(@p); }
func detatch(p:pthread_t) C_code { pthread_detach(@p); }
struct IntQueue(_queue:@[Int], _mutex:@pthread_mutex_t, _cond:@pthread_cond_t)
func new(initial:[Int]=[] -> IntQueue)
return IntQueue(@initial, pthread_mutex_t.new(), pthread_cond_t.new())
func give(q:IntQueue, n:Int)
do q._mutex.lock()
q._queue.insert(n)
q._mutex.unlock()
q._cond.signal()
func take(q:IntQueue -> Int)
do q._mutex.lock()
n := q._queue.pop(1)
while not n
q._cond.wait(q._mutex)
n = q._queue.pop(1)
q._mutex.unlock()
return n!
func main()
jobs := IntQueue.new()
results := IntQueue.new()
say_mutex := pthread_mutex_t.new()
announce := func(speaker:Text, text:Text)
do say_mutex.lock()
say("\[2][$speaker]\[] $text")
say_mutex.unlock()
worker := pthread_t.new(func()
say("I'm in the thread!")
repeat
announce("worker", "waiting for job")
job := jobs.take()
result := job * 10
announce("worker", "Jobbing $job into $result")
results.give(result)
announce("worker", "Signaled $result")
)
for i in 10
announce("boss", "Pushing job $i")
jobs.give(i)
announce("boss", "Gave job $i")
for i in 10
announce("boss", "Getting result...")
result := results.take()
announce("boss", "Got result $result")
>> worker.cancel()
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