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#+build windows
#+private
package thread
import "base:intrinsics"
import "base:runtime"
import "core:sync"
import win32 "core:sys/windows"
_IS_SUPPORTED :: true
Thread_Os_Specific :: struct {
win32_thread: win32.HANDLE,
win32_thread_id: win32.DWORD,
mutex: sync.Mutex,
start_ok: sync.Sema,
}
_thread_priority_map := [Thread_Priority]i32{
.Normal = 0,
.Low = -2,
.High = +2,
}
_create :: proc(procedure: Thread_Proc, priority: Thread_Priority) -> ^Thread {
win32_thread_id: win32.DWORD
__windows_thread_entry_proc :: proc "system" (t_: rawptr) -> win32.DWORD {
t := (^Thread)(t_)
for (.Started not_in sync.atomic_load(&t.flags)) {
sync.wait(&t.start_ok)
}
{
init_context := t.init_context
// NOTE(tetra, 2023-05-31): Must do this AFTER thread.start() is called, so that the user can set the init_context, etc!
// Here on Windows, the thread is created in a suspended state, and so we can select the context anywhere before the call
// to t.procedure().
context = _select_context_for_thread(init_context)
defer {
_maybe_destroy_default_temp_allocator(init_context)
runtime.run_thread_local_cleaners()
}
t.procedure(t)
}
intrinsics.atomic_or(&t.flags, {.Done})
if .Self_Cleanup in sync.atomic_load(&t.flags) {
win32.CloseHandle(t.win32_thread)
t.win32_thread = win32.INVALID_HANDLE
// NOTE(ftphikari): It doesn't matter which context 'free' received, right?
context = {}
free(t, t.creation_allocator)
}
return 0
}
thread := new(Thread)
if thread == nil {
return nil
}
thread.creation_allocator = context.allocator
win32_thread := win32.CreateThread(nil, 0, __windows_thread_entry_proc, thread, win32.CREATE_SUSPENDED, &win32_thread_id)
if win32_thread == nil {
free(thread, thread.creation_allocator)
return nil
}
thread.procedure = procedure
thread.win32_thread = win32_thread
thread.win32_thread_id = win32_thread_id
thread.id = int(win32_thread_id)
ok := win32.SetThreadPriority(win32_thread, _thread_priority_map[priority])
assert(ok == true)
return thread
}
_start :: proc(t: ^Thread) {
sync.guard(&t.mutex)
t.flags += {.Started}
win32.ResumeThread(t.win32_thread)
}
_is_done :: proc(t: ^Thread) -> bool {
// NOTE(tetra, 2019-10-31): Apparently using wait_for_single_object and
// checking if it didn't time out immediately, is not good enough,
// so we do it this way instead.
return .Done in sync.atomic_load(&t.flags)
}
_join :: proc(t: ^Thread) {
sync.guard(&t.mutex)
if .Joined in t.flags || t.win32_thread == win32.INVALID_HANDLE {
return
}
for (.Started not_in sync.atomic_load(&t.flags)) {
_start(t)
}
win32.WaitForSingleObject(t.win32_thread, win32.INFINITE)
win32.CloseHandle(t.win32_thread)
t.win32_thread = win32.INVALID_HANDLE
t.flags += {.Joined}
}
_join_multiple :: proc(threads: ..^Thread) {
MAXIMUM_WAIT_OBJECTS :: 64
handles: [MAXIMUM_WAIT_OBJECTS]win32.HANDLE
for k := 0; k < len(threads); k += MAXIMUM_WAIT_OBJECTS {
count := min(len(threads) - k, MAXIMUM_WAIT_OBJECTS)
j := 0
for i in 0..<count {
handle := threads[i+k].win32_thread
if handle != win32.INVALID_HANDLE {
handles[j] = handle
j += 1
}
}
win32.WaitForMultipleObjects(u32(j), &handles[0], true, win32.INFINITE)
}
for t in threads {
win32.CloseHandle(t.win32_thread)
t.win32_thread = win32.INVALID_HANDLE
t.flags += {.Joined}
}
}
_destroy :: proc(thread: ^Thread) {
_join(thread)
free(thread, thread.creation_allocator)
}
_terminate :: proc(thread: ^Thread, exit_code: int) {
win32.TerminateThread(thread.win32_thread, u32(exit_code))
}
_yield :: proc() {
win32.SwitchToThread()
}
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