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Make detached threads work better

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This change adds a double linked list of threads, so that pthread_exit()
will know when it should call exit() from an orphaned child. This change
also improves ftrace and strace logging.
This commit is contained in:
Justine Tunney 2022-11-09 03:58:57 -08:00
parent b74d8c1acd
commit cee6871710
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GPG key ID: BE714B4575D6E328
37 changed files with 638 additions and 314 deletions
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21
libc/runtime/enable_tls.c
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@ -28,15 +28,19 @@
#include "libc/runtime/internal.h"
#include "libc/runtime/runtime.h"
#include "libc/thread/posixthread.internal.h"
#include "libc/thread/thread.h"
#include "libc/thread/tls.h"
#define _TLSZ ((intptr_t)_tls_size)
#define _TLDZ ((intptr_t)_tdata_size)
#define _TIBZ sizeof(struct CosmoTib)
struct PosixThread _pthread_main;
extern unsigned char __tls_mov_nt_rax[];
extern unsigned char __tls_add_nt_rax[];
nsync_dll_list_ _pthread_list;
pthread_spinlock_t _pthread_lock;
static struct PosixThread _pthread_main;
_Alignas(TLS_ALIGNMENT) static char __static_tls[5008];
/**
@ -79,6 +83,7 @@ void __enable_tls(void) {
size_t siz;
struct CosmoTib *tib;
char *mem, *tls;
siz = ROUNDUP(_TLSZ + _TIBZ, _Alignof(__static_tls));
if (siz <= sizeof(__static_tls)) {
// if tls requirement is small then use the static tls block
@ -95,12 +100,15 @@ void __enable_tls(void) {
mem = _weaken(_mapanon)(siz);
_npassert(mem);
}
if (IsAsan()) {
// poison the space between .tdata and .tbss
__asan_poison(mem + (intptr_t)_tdata_size,
(intptr_t)_tbss_offset - (intptr_t)_tdata_size,
kAsanProtected);
}
// initialize main thread tls memory
tib = (struct CosmoTib *)(mem + siz - _TIBZ);
tls = mem + siz - _TIBZ - _TLSZ;
tib->tib_self = tib;
@ -117,9 +125,16 @@ void __enable_tls(void) {
tid = sys_gettid();
}
atomic_store_explicit(&tib->tib_tid, tid, memory_order_relaxed);
_pthread_main.ptid = tid;
// initialize posix threads
_pthread_main.tib = tib;
_pthread_main.flags = PT_MAINTHREAD;
_pthread_main.flags = PT_STATIC;
_pthread_main.list.prev = _pthread_main.list.next = //
_pthread_list = VEIL("r", &_pthread_main.list);
_pthread_main.list.container = &_pthread_main;
atomic_store_explicit(&_pthread_main.ptid, tid, memory_order_relaxed);
// copy in initialized data section
__repmovsb(tls, _tdata_start, _TLDZ);
// ask the operating system to change the x86 segment register