mirrors/cosmopolitan
1
0
Fork 0
mirror of https://github.com/jart/cosmopolitan.git synced 2025-06-28 07:18:30 +00:00
Code Issues Projects Releases Packages Wiki Activity Actions 1

Make some fixups to POSIX threads

Browse source
This commit is contained in:
Justine Tunney 2022-09-07 21:13:50 -07:00
parent de511bc71a
commit 6c323383e5
No known key found for this signature in database
GPG key ID: BE714B4575D6E328
12 changed files with 168 additions and 69 deletions
Download patch file Download diff file Expand all files Collapse all files

42
libc/intrin/exit1.greg.c
View file

@ -18,38 +18,56 @@
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/calls/strace.internal.h"
#include "libc/dce.h"
#include "libc/intrin/asmflag.h"
#include "libc/intrin/promises.internal.h"
#include "libc/nt/thread.h"
#include "libc/runtime/runtime.h"
#include "libc/sysv/consts/nr.h"
__msabi extern typeof(ExitThread) *const __imp_ExitThread;
/**
* Terminates thread with raw system call.
*
* If this is the main thread, or an orphaned child thread, then this
* function is equivalent to exiting the process; however, `rc` shall
* only be reported to the parent process on Linux, FreeBSD & Windows
* whereas on other platforms, it'll be silently coerced to zero.
*
* @param rc only works on Linux and Windows
* @see cthread_exit()
* @threadsafe
* @noreturn
*/
privileged wontreturn void _Exit1(int rc) {
struct WinThread *wt;
char cf;
int ax, dx, di, si;
STRACE("_Exit1(%d)", rc);
if (!IsWindows() && !IsMetal()) {
if (IsOpenbsd() && !PLEDGED(STDIO)) {
// exit() on Linux
// thr_exit() on FreeBSD
// __threxit() on OpenBSD
// __lwp_exit() on NetBSD
// __bsdthread_terminate() on XNU
asm volatile(CFLAG_ASM("xor\t%%r10d,%%r10d\n\t"
"syscall")
: CFLAG_CONSTRAINT(cf), "=a"(ax), "=d"(dx), "=D"(di), "=S"(si)
: "1"(__NR_exit), "3"(IsLinux() ? rc : 0), "4"(0), "2"(0)
: "rcx", "r8", "r9", "r10", "r11", "memory");
if ((IsFreebsd() && !cf && !ax) || (SupportsFreebsd() && IsTiny())) {
// FreeBSD checks if this is either the main thread by itself, or
// the last running child thread in which case thr_exit() returns
// zero with an error. In that case we'll exit the whole process.
// FreeBSD thr_exit() can even clobber registers, like r8 and r9!
asm volatile("syscall"
: /* no outputs */
: "a"(__NR_exit), "D"(rc)
: "a"(__NR_exit_group), "D"(rc)
: "rcx", "r11", "memory");
unreachable;
}
asm volatile("xor\t%%r10d,%%r10d\n\t"
"syscall"
: /* no outputs */
: "a"(__NR_exit), "D"(IsLinux() ? rc : 0), "S"(0), "d"(0)
: "rcx", "r10", "r11", "memory");
} else if (IsWindows()) {
ExitThread(rc);
}
for (;;) {
asm("ud2");
__imp_ExitThread(rc);
unreachable;
}
notpossible;
}