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[WIP] Threading phase 2 (#301)

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* Exponential back-off
* Removed "native" specifier
* Abstract away Futex for cthread
* Complete setup for TLS (including main thread)
This commit is contained in:
Florian Lemaitre 2021-10-26 01:02:26 +02:00 • committed by GitHub
parent 660ff56d40
commit 45a7435788
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GPG key ID: 4AEE18F83AFDEB23
11 changed files with 249 additions and 78 deletions
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14
libc/thread/create.c
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@ -19,17 +19,25 @@
#include "libc/errno.h"
#include "libc/linux/clone.h"
#include "libc/runtime/runtime.h"
#include "libc/str/str.h"
#include "libc/sysv/consts/clone.h"
#include "libc/sysv/consts/map.h"
#include "libc/sysv/consts/nr.h"
#include "libc/sysv/consts/prot.h"
#include "libc/thread/create.h"
// TLS boundaries
extern char _tbss_start, _tbss_end, _tdata_start, _tdata_end;
static cthread_t _thread_allocate(const cthread_attr_t* attr) {
//extern void _main_thread_init(void);
//void (*dummy)(void) = &_main_thread_init;
//asm(""::"r"(dummy));
size_t stacksize = attr->stacksize;
size_t guardsize = attr->guardsize;
// FIXME: properly count TLS size
size_t tlssize = 0;
size_t tbsssize = &_tbss_end - &_tbss_start;
size_t tdatasize = &_tdata_end - &_tdata_start;
size_t tlssize = tbsssize + tdatasize;
size_t totalsize =
3 * guardsize + stacksize + tlssize + sizeof(struct cthread_descriptor_t);
@ -64,6 +72,8 @@ static cthread_t _thread_allocate(const cthread_attr_t* attr) {
td->alloc.bottom = alloc_bottom;
td->state = (attr->mode & CTHREAD_CREATE_DETACHED) ? cthread_detached
: cthread_started;
// Initialize TLS with content of .tdata section
memmove((void*)((uintptr_t)td - tlssize), &_tdata_start, tdatasize);
return td;
}