mirrors/cosmopolitan
1
0
Fork 0
mirror of https://github.com/jart/cosmopolitan.git synced 2025-06-27 23:08:31 +00:00
Code Issues Projects Releases Packages Wiki Activity Actions 1

Use futexes on OpenBSD and improve threading

Browse source
This commit is contained in:
Justine Tunney 2022-07-17 19:59:49 -07:00
parent 5b11033d4d
commit 4f4889ddf7
17 changed files with 114 additions and 63 deletions
Download patch file Download diff file Expand all files Collapse all files

9
libc/runtime/clone.c
View file

@ -306,11 +306,14 @@ noasan static wontreturn void OpenbsdThreadMain(void *p) {
// although ideally there should be a better solution.
//
// void __threxit(%rdi = int32_t *notdead);
asm volatile("mov\t%2,%%rsp\n\t" // set stack
asm volatile("mov\t%2,%%rsp\n\t"
"movl\t$0,(%%rdi)\n\t" // *wt->ztid = 0
"syscall" // __threxit()
"syscall\n\t" // futex()
"mov\t$302,%%eax\n\t" // threxit()
"syscall"
: "=m"(*wt->ztid)
: "a"(302), "m"(oldrsp), "D"(wt->ztid)
: "a"(83), "m"(oldrsp), "D"(wt->ztid), "S"(FUTEX_WAKE),
"d"(INT_MAX)
: "rcx", "r11", "memory");
unreachable;
}