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#include "../../include/std/thread.h"
#include "../../include/std/log.h"
#include <stdio.h>
#include <assert.h>
#include <errno.h>
#include <string.h>
#include <sys/sysinfo.h>
#include <sys/types.h>
#include <sys/syscall.h>
#include <unistd.h>
static int thread_type_to_system_thread_type(amal_thread_type thread_type) {
switch(thread_type) {
case AMAL_THREAD_JOINABLE: return PTHREAD_CREATE_JOINABLE;
case AMAL_THREAD_DETACHED: return PTHREAD_CREATE_DETACHED;
}
assert(bool_false);
return PTHREAD_CREATE_JOINABLE;
}
int amal_thread_create(amal_thread *self, amal_thread_type thread_type, const char *name, AmalThreadCallbackFunc callback_func, void *userdata) {
int result;
self->name = name;
self->thread_id = 0;
self->cancellable = bool_false;
self->destroyable = bool_false;
if((result = pthread_attr_init(&self->thread_attr)) != 0) {
perror("amal_thread_create");
return result;
}
self->destroyable = bool_true;
if((result = pthread_attr_setdetachstate(&self->thread_attr, thread_type_to_system_thread_type(thread_type))) != 0) {
perror("amal_thread_create");
return result;
}
if((result = pthread_create(&self->thread_id, &self->thread_attr, callback_func, userdata)) != 0) {
perror("amal_thread_create");
return result;
}
self->cancellable = bool_true;
return 0;
}
int amal_thread_deinit(amal_thread *self) {
int r1;
int r2;
r1 = 0;
r2 = 0;
if(self->cancellable) {
r1 = pthread_cancel(self->thread_id);
/* thread deinit on a thread that has not been started shouldn't be an error */
if(r1 == ESRCH)
r1 = 0;
if(r1 != 0)
amal_log_error("amal_thread_deinit: failed to cancel thread, error: %s", strerror(r1));
self->cancellable = bool_false;
}
if(self->destroyable) {
r2 = pthread_attr_destroy(&self->thread_attr);
if(r2 != 0)
amal_log_error("amal_thread_deinit: failed to destroy thread attributes, error: %s", strerror(r2));
self->destroyable = bool_false;
}
return r1 != 0 ? r1 : r2;
}
int amal_thread_detach(amal_thread *self) {
int result_err;
int thread_type;
if((result_err = pthread_attr_getdetachstate(&self->thread_attr, &thread_type)) != 0)
return result_err;
if(thread_type != PTHREAD_CREATE_DETACHED)
return AMAL_THREAD_ERR;
if((result_err = pthread_detach(self->thread_id)) != 0)
return result_err;
self->cancellable = bool_false;
return 0;
}
int amal_thread_join(amal_thread *self, void **result) {
int result_err;
int thread_type;
if((result_err = pthread_attr_getdetachstate(&self->thread_attr, &thread_type)) != 0) {
amal_log_error("amal_thread_join: failed to get detach state, error: %d", result_err);
return result_err;
}
if(thread_type != PTHREAD_CREATE_JOINABLE) {
amal_log_error("amal_thread_join: thread not joinable type");
return AMAL_THREAD_NOT_JOINABLE;
}
if((result_err = pthread_join(self->thread_id, result)) != 0) {
/* Joining a thread that is not joinable (has already finished) shouldn't be an error */
if(result_err == ESRCH)
goto cleanup;
amal_log_error("amal_thread_join: failed to join thread %llu, error: %s", self->thread_id, strerror(result_err));
return result_err == EINVAL ? AMAL_THREAD_NOT_JOINABLE : result_err;
}
cleanup:
self->cancellable = bool_false;
return 0;
}
int amal_mutex_init(amal_mutex *self) {
#ifdef AMAL_MUTEX_DEBUG
self->lock_identifier = NULL;
#endif
self->locked = bool_false;
self->owner_thread = 0;
return pthread_mutex_init(&self->mutex, NULL);
}
void amal_mutex_deinit(amal_mutex *self) {
pthread_mutex_destroy(&self->mutex);
}
static long amal_process_get_id(void) {
return getpid();
}
static long amal_thread_get_id(void) {
return syscall(SYS_gettid);
}
int amal_mutex_lock(amal_mutex *self, const char *lock_identifier) {
int result;
result = pthread_mutex_lock(&self->mutex);
self->owner_thread = pthread_self();
self->locked = bool_true;
(void)lock_identifier;
#ifdef AMAL_MUTEX_DEBUG
self->lock_identifier = lock_identifier;
if(result == 0 && self->lock_identifier) {
amal_log_debug("amal_mutex_lock: mutex locked by thread %lu (%s), identification: %s",
amal_thread_get_id(),
amal_thread_is_main() ? "main" : "not main",
self->lock_identifier ? self->lock_identifier : "none");
}
#endif
return result;
}
int amal_mutex_unlock(amal_mutex *self) {
int result;
#ifdef AMAL_MUTEX_DEBUG
const char *identifier;
identifier = self->lock_identifier;
#endif
/* No-op if mutex isn't locked or if another thread owns the mutex lock */
if(!self->locked || pthread_equal(self->owner_thread, pthread_self()) == 0)
return 0;
self->locked = bool_false;
self->owner_thread = 0;
result = pthread_mutex_unlock(&self->mutex);
#ifdef AMAL_MUTEX_DEBUG
if(result == 0 && identifier) {
amal_log_debug("amal_mutex_unlock: mutex unlocked by thread %lu (%s), identification: %s",
amal_thread_get_id(),
amal_thread_is_main() ? "main" : "not main",
identifier ? identifier : "none");
}
#endif
return result;
}
void amal_mutex_tryunlock(amal_mutex *self) {
ignore_result_int(amal_mutex_unlock(self));
}
bool amal_thread_is_main(void) {
#ifndef __linux__
#error Fix this for non-linux platforms!
#endif
return amal_thread_get_id() == amal_process_get_id();
}
int amal_get_usable_thread_count(void) {
return get_nprocs();
}
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