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Modernize Thread

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- Based on C++11's `thread` and `thread_local`
- No more need to allocate-deallocate or check for null
- No pointer anymore, just a member variable
- Platform-specific implementations no longer needed (except for the few cases of non-portable functions)
- Simpler for `NO_THREADS`
- Thread ids are now the same across platforms (main is 1; others follow)
This commit is contained in:
Pedro J. Estébanez
2021-01-19 13:29:41 +01:00
parent 6ddfc8e718
commit 99fe462452
87 changed files with 385 additions and 1056 deletions
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96
drivers/unix/thread_posix.cpp
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@@ -28,88 +28,14 @@
/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
/*************************************************************************/
#include "thread_posix.h"
#if (defined(UNIX_ENABLED) || defined(PTHREAD_ENABLED)) && !defined(NO_THREADS)
#include "core/object/script_language.h"
#include "core/os/memory.h"
#include "core/templates/safe_refcount.h"
#include "thread_posix.h"
#ifdef PTHREAD_BSD_SET_NAME
#include <pthread_np.h>
#endif
#include "core/os/thread.h"
#include "core/string/ustring.h"
static void _thread_id_key_destr_callback(void *p_value) {
memdelete(static_cast<Thread::ID *>(p_value));
}
static pthread_key_t _create_thread_id_key() {
pthread_key_t key;
pthread_key_create(&key, &_thread_id_key_destr_callback);
return key;
}
pthread_key_t ThreadPosix::thread_id_key = _create_thread_id_key();
Thread::ID ThreadPosix::next_thread_id = 0;
Thread::ID ThreadPosix::get_id() const {
return id;
}
Thread *ThreadPosix::create_thread_posix() {
return memnew(ThreadPosix);
}
void *ThreadPosix::thread_callback(void *userdata) {
ThreadPosix *t = reinterpret_cast<ThreadPosix *>(userdata);
t->id = atomic_increment(&next_thread_id);
pthread_setspecific(thread_id_key, (void *)memnew(ID(t->id)));
ScriptServer::thread_enter(); //scripts may need to attach a stack
t->callback(t->user);
ScriptServer::thread_exit();
return nullptr;
}
Thread *ThreadPosix::create_func_posix(ThreadCreateCallback p_callback, void *p_user, const Settings &) {
ThreadPosix *tr = memnew(ThreadPosix);
tr->callback = p_callback;
tr->user = p_user;
pthread_attr_init(&tr->pthread_attr);
pthread_attr_setdetachstate(&tr->pthread_attr, PTHREAD_CREATE_JOINABLE);
pthread_attr_setstacksize(&tr->pthread_attr, 256 * 1024);
pthread_create(&tr->pthread, &tr->pthread_attr, thread_callback, tr);
return tr;
}
Thread::ID ThreadPosix::get_thread_id_func_posix() {
void *value = pthread_getspecific(thread_id_key);
if (value) {
return *static_cast<ID *>(value);
}
ID new_id = atomic_increment(&next_thread_id);
pthread_setspecific(thread_id_key, (void *)memnew(ID(new_id)));
return new_id;
}
void ThreadPosix::wait_to_finish_func_posix(Thread *p_thread) {
ThreadPosix *tp = static_cast<ThreadPosix *>(p_thread);
ERR_FAIL_COND(!tp);
ERR_FAIL_COND(tp->pthread == 0);
pthread_join(tp->pthread, nullptr);
tp->pthread = 0;
}
Error ThreadPosix::set_name_func_posix(const String &p_name) {
static Error set_name(const String &p_name) {
#ifdef PTHREAD_NO_RENAME
return ERR_UNAVAILABLE;
@@ -137,20 +63,10 @@ Error ThreadPosix::set_name_func_posix(const String &p_name) {
return err == 0 ? OK : ERR_INVALID_PARAMETER;
#endif // PTHREAD_NO_RENAME
};
void ThreadPosix::make_default() {
create_func = create_func_posix;
get_thread_id_func = get_thread_id_func_posix;
wait_to_finish_func = wait_to_finish_func_posix;
set_name_func = set_name_func_posix;
}
ThreadPosix::ThreadPosix() {
pthread = 0;
}
ThreadPosix::~ThreadPosix() {
void init_thread_posix() {
Thread::_set_platform_funcs(&set_name, nullptr);
}
#endif