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LibPthread: Partially implement pthread_cleanup_(push pop)

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These are also supposed to run on cancellation, but we don't support
cancellation.
This commit is contained in:
Ali Mohammad Pur 2022-02-24 04:22:54 +03:30 • committed by Linus Groh
parent 31a2ac94c7
commit 5d51e26caf
1 changed files with 15 additions and 4 deletions
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19
Userland/Libraries/LibPthread/pthread.cpp
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@ -9,6 +9,7 @@
#include <AK/Debug.h>
#include <AK/Format.h>
#include <AK/StdLibExtras.h>
#include <AK/Vector.h>
#include <Kernel/API/Syscall.h>
#include <LibSystem/syscall.h>
#include <bits/pthread_integration.h>
@ -37,6 +38,12 @@ static constexpr size_t highest_reasonable_stack_size = 8 * MiB; // That's the d
__thread void* s_stack_location;
__thread size_t s_stack_size;
struct CleanupHandler {
void (*function)(void*) { nullptr };
void* argument { nullptr };
};
thread_local Vector<CleanupHandler> s_cleanup_handlers {};
#define __RETURN_PTHREAD_ERROR(rc) \
return ((rc) < 0 ? -(rc) : 0)
@ -139,19 +146,23 @@ 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)
{
while (!s_cleanup_handlers.is_empty())
pthread_cleanup_pop(1);
exit_thread(value_ptr, s_stack_location, s_stack_size);
}
// 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();
s_cleanup_handlers.empend(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();
auto entry = s_cleanup_handlers.take_last();
if (execute != 0)
entry.function(entry.argument);
}
// https://pubs.opengroup.org/onlinepubs/009695399/functions/pthread_join.html