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/**************************************************************************/
/* */
/* OCaml */
/* */
/* Xavier Leroy and Damien Doligez, INRIA Rocquencourt */
/* */
/* Copyright 1996 Institut National de Recherche en Informatique et */
/* en Automatique. */
/* */
/* All rights reserved. This file is distributed under the terms of */
/* the GNU Lesser General Public License version 2.1, with the */
/* special exception on linking described in the file LICENSE. */
/* */
/**************************************************************************/
#define CAML_INTERNALS
#include "caml/alloc.h"
#include "caml/custom.h"
#include "caml/domain_state.h"
#include "caml/fail.h"
#include "caml/memory.h"
#include "caml/signals.h"
#include "caml/sync.h"
#include "caml/sys.h"
#include "caml/runtime_events.h"
/* System-dependent part */
#include "sync_posix.h"
/* Mutex operations */
static void caml_mutex_finalize(value wrapper)
{
sync_mutex_destroy(Mutex_val(wrapper));
}
static int caml_mutex_compare(value wrapper1, value wrapper2)
{
sync_mutex mut1 = Mutex_val(wrapper1);
sync_mutex mut2 = Mutex_val(wrapper2);
return mut1 == mut2 ? 0 : mut1 < mut2 ? -1 : 1;
}
static intnat caml_mutex_hash(value wrapper)
{
return (intnat) (Mutex_val(wrapper));
}
static const struct custom_operations caml_mutex_ops = {
"_mutex",
caml_mutex_finalize,
caml_mutex_compare,
caml_mutex_hash,
custom_serialize_default,
custom_deserialize_default,
custom_compare_ext_default,
custom_fixed_length_default
};
CAMLexport int caml_mutex_lock(sync_mutex mut)
{
return sync_mutex_lock(mut);
}
CAMLexport int caml_mutex_unlock(sync_mutex mut)
{
return sync_mutex_unlock(mut);
}
CAMLprim value caml_ml_mutex_new(value unit)
{
sync_mutex mut = NULL;
value wrapper;
sync_check_error(sync_mutex_create(&mut), "Mutex.create");
wrapper = caml_alloc_custom(&caml_mutex_ops, sizeof(pthread_mutex_t *),
0, 1);
Mutex_val(wrapper) = mut;
return wrapper;
}
CAMLprim value caml_ml_mutex_lock(value wrapper)
{
CAMLparam1(wrapper);
sync_retcode retcode;
sync_mutex mut = Mutex_val(wrapper);
/* PR#4351: first try to acquire mutex without releasing the master lock */
if (sync_mutex_trylock(mut) != MUTEX_PREVIOUSLY_UNLOCKED) {
/* If unsuccessful, block on mutex */
caml_enter_blocking_section();
retcode = sync_mutex_lock(mut);
caml_leave_blocking_section();
sync_check_error(retcode, "Mutex.lock");
}
CAMLreturn(Val_unit);
}
CAMLprim value caml_ml_mutex_unlock(value wrapper)
{
sync_retcode retcode;
sync_mutex mut = Mutex_val(wrapper);
/* PR#4351: no need to release and reacquire master lock */
retcode = sync_mutex_unlock(mut);
sync_check_error(retcode, "Mutex.unlock");
return Val_unit;
}
CAMLprim value caml_ml_mutex_try_lock(value wrapper)
{
sync_mutex mut = Mutex_val(wrapper);
sync_retcode retcode;
retcode = sync_mutex_trylock(mut);
if (retcode == MUTEX_ALREADY_LOCKED) return Val_false;
sync_check_error(retcode, "Mutex.try_lock");
return Val_true;
}
/* Condition variables operations */
static void caml_condition_finalize(value wrapper)
{
sync_condvar_destroy(Condition_val(wrapper));
}
static int caml_condition_compare(value wrapper1, value wrapper2)
{
sync_condvar cond1 = Condition_val(wrapper1);
sync_condvar cond2 = Condition_val(wrapper2);
return cond1 == cond2 ? 0 : cond1 < cond2 ? -1 : 1;
}
static intnat caml_condition_hash(value wrapper)
{
return (intnat) (Condition_val(wrapper));
}
static struct custom_operations caml_condition_ops = {
"_condition",
caml_condition_finalize,
caml_condition_compare,
caml_condition_hash,
custom_serialize_default,
custom_deserialize_default,
custom_compare_ext_default,
custom_fixed_length_default
};
CAMLprim value caml_ml_condition_new(value unit)
{
value wrapper;
sync_condvar cond = NULL;
sync_check_error(sync_condvar_create(&cond), "Condition.create");
wrapper = caml_alloc_custom(&caml_condition_ops, sizeof(sync_condvar *),
0, 1);
Condition_val(wrapper) = cond;
return wrapper;
}
CAMLprim value caml_ml_condition_wait(value wcond, value wmut)
{
CAMLparam2(wcond, wmut);
sync_condvar cond = Condition_val(wcond);
sync_mutex mut = Mutex_val(wmut);
sync_retcode retcode;
CAML_EV_BEGIN(EV_DOMAIN_CONDITION_WAIT);
caml_enter_blocking_section();
retcode = sync_condvar_wait(cond, mut);
caml_leave_blocking_section();
sync_check_error(retcode, "Condition.wait");
CAML_EV_END(EV_DOMAIN_CONDITION_WAIT);
CAMLreturn(Val_unit);
}
CAMLprim value caml_ml_condition_signal(value wrapper)
{
sync_check_error(sync_condvar_signal(Condition_val(wrapper)),
"Condition.signal");
return Val_unit;
}
CAMLprim value caml_ml_condition_broadcast(value wrapper)
{
sync_check_error(sync_condvar_broadcast(Condition_val(wrapper)),
"Condition.broadcast");
return Val_unit;
}
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