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sortix--sortix/libpthread/pthread_initialize.c++
Jonas 'Sortie' Termansen bbf454e164 Rewrite program loader.
2014-12-04 16:14:17 +01:00

82 lines
2.5 KiB
C++

/*******************************************************************************
Copyright(C) Jonas 'Sortie' Termansen 2013, 2014.
This file is part of Sortix libpthread.
Sortix libpthread is free software: you can redistribute it and/or modify it
under the terms of the GNU Lesser General Public License as published by the
Free Software Foundation, either version 3 of the License, or (at your
option) any later version.
Sortix libpthread is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
License for more details.
You should have received a copy of the GNU Lesser General Public License
along with Sortix libpthread. If not, see <http://www.gnu.org/licenses/>.
pthread_initialize.c++
Prepares the process for pthread usage.
*******************************************************************************/
#include <elf.h>
#include <errno.h>
#include <pthread.h>
#include <signal.h>
#include <stddef.h>
#include <stdint.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
extern "C" { pthread_mutex_t __pthread_keys_lock =
PTHREAD_RECURSIVE_MUTEX_INITIALIZER_NP; }
extern "C" { struct pthread_key* __pthread_keys = NULL; }
extern "C" { size_t __pthread_keys_used = 0; }
extern "C" { size_t __pthread_keys_length = 0; }
// Emit an ELF note containing the size and alignment of struct pthread.
__attribute__((used))
static void elf_note_sortix_pthread_size()
{
asm volatile (
".pushsection .note.sortix,\"a\",@note\n\t"
".align 4\n\t"
".long 2f-1f\n\t" // namesz
".long 4f-3f\n\t" // descsz
".long %c0\n" // type
"1:\n\t"
".string \"Sortix\"\n" // name
"2:\n\t"
".align 4\n"
"3:\n\t"
#if defined(__x86_64__)
".quad %c1\n"
".quad %c2\n"
#elif defined(__i386__)
".long %c1\n"
".long %c2\n"
#endif
"4:\n\t"
".align 4\n\t"
".popsection\n\t"
:: "n"(ELF_NOTE_SORTIX_UTHREAD_SIZE),
"n"(sizeof(struct pthread)),
"n"(alignof(struct pthread))
);
}
extern "C" void pthread_initialize(void)
{
struct pthread* self = pthread_self();
self->join_lock = PTHREAD_NORMAL_MUTEX_INITIALIZER_NP;
self->join_lock.lock = 1 /* LOCKED_VALUE */;
self->join_lock.type = PTHREAD_MUTEX_NORMAL;
self->join_lock.owner = (unsigned long) self;
self->detach_lock = PTHREAD_NORMAL_MUTEX_INITIALIZER_NP;
self->detach_state = PTHREAD_CREATE_JOINABLE;
}