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LibPthread: Implement cleanup handlers

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This commit is contained in:
Tim Schumacher 2022-05-05 10:37:29 +02:00 • committed by Linus Groh
parent b3e0aed91f
commit 2a27644220
1 changed files with 36 additions and 13 deletions
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49
Userland/Libraries/LibPthread/pthread.cpp
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@ -8,6 +8,7 @@
#include <AK/Atomic.h>
#include <AK/Debug.h>
#include <AK/Format.h>
#include <AK/SinglyLinkedList.h>
#include <AK/StdLibExtras.h>
#include <Kernel/API/Syscall.h>
#include <LibSystem/syscall.h>
@ -40,8 +41,27 @@ __thread size_t s_stack_size;
#define __RETURN_PTHREAD_ERROR(rc) \
return ((rc) < 0 ? -(rc) : 0)
struct CleanupHandler {
void (*routine)(void*);
void* argument;
};
static thread_local SinglyLinkedList<CleanupHandler> cleanup_handlers;
extern "C" {
[[noreturn]] static void exit_thread(void* code, void* stack_location, size_t stack_size)
{
__pthread_key_destroy_for_current_thread();
syscall(SC_exit_thread, code, stack_location, stack_size);
VERIFY_NOT_REACHED();
}
[[noreturn]] static void pthread_exit_without_cleanup_handlers(void* value_ptr)
{
exit_thread(value_ptr, s_stack_location, s_stack_size);
}
static void* pthread_create_helper(void* (*routine)(void*), void* argument, void* stack_location, size_t stack_size)
{
// HACK: This is a __thread - marked thread-local variable. If we initialize it globally, VERY weird errors happen.
@ -50,7 +70,7 @@ static void* pthread_create_helper(void* (*routine)(void*), void* argument, void
s_stack_location = stack_location;
s_stack_size = stack_size;
void* ret_val = routine(argument);
pthread_exit(ret_val);
pthread_exit_without_cleanup_handlers(ret_val);
}
static int create_thread(pthread_t* thread, void* (*entry)(void*), void* argument, PthreadAttrImpl* thread_params)
@ -91,13 +111,6 @@ static int create_thread(pthread_t* thread, void* (*entry)(void*), void* argumen
__RETURN_PTHREAD_ERROR(rc);
}
[[noreturn]] static void exit_thread(void* code, void* stack_location, size_t stack_size)
{
__pthread_key_destroy_for_current_thread();
syscall(SC_exit_thread, code, stack_location, stack_size);
VERIFY_NOT_REACHED();
}
// https://pubs.opengroup.org/onlinepubs/009695399/functions/pthread_self.html
int pthread_self()
{
@ -139,19 +152,29 @@ int pthread_create(pthread_t* thread, pthread_attr_t* attributes, void* (*start_
// https://pubs.opengroup.org/onlinepubs/009695399/functions/pthread_exit.html
void pthread_exit(void* value_ptr)
{
exit_thread(value_ptr, s_stack_location, s_stack_size);
while (!cleanup_handlers.is_empty()) {
auto handler = cleanup_handlers.take_first();
handler.routine(handler.argument);
}
pthread_exit_without_cleanup_handlers(value_ptr);
}
// https://pubs.opengroup.org/onlinepubs/009695399/functions/pthread_cleanup_push.html
void pthread_cleanup_push([[maybe_unused]] void (*routine)(void*), [[maybe_unused]] void* arg)
void pthread_cleanup_push(void (*routine)(void*), void* arg)
{
TODO();
cleanup_handlers.prepend({ routine, arg });
}
// https://pubs.opengroup.org/onlinepubs/009695399/functions/pthread_cleanup_pop.html
void pthread_cleanup_pop([[maybe_unused]] int execute)
void pthread_cleanup_pop(int execute)
{
TODO();
VERIFY(!cleanup_handlers.is_empty());
auto handler = cleanup_handlers.take_first();
if (execute)
handler.routine(handler.argument);
}
// https://pubs.opengroup.org/onlinepubs/009695399/functions/pthread_join.html