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Make threads faster and more reliable

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This change doubles the performance of thread spawning. That's thanks to
our new stack manager, which allows us to avoid zeroing stacks. It gives
us 15µs spawns rather than 30µs spawns on Linux. Also, pthread_exit() is
faster now, since it doesn't need to acquire the pthread GIL. On NetBSD,
that helps us avoid allocating too many semaphores. Even if that happens
we're now able to survive semaphores running out and even memory running
out, when allocating *NSYNC waiter objects. I found a lot more rare bugs
in the POSIX threads runtime that could cause things to crash, if you've
got dozens of threads all spawning and joining dozens of threads. I want
cosmo to be world class production worthy for 2025 so happy holidays all
This commit is contained in:
Justine Tunney 2024-12-18 04:59:02 -08:00
parent 906bd06a5a
commit 624573207e
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GPG key ID: BE714B4575D6E328
51 changed files with 1006 additions and 321 deletions
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15
libc/proc/fork-nt.c
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@ -62,7 +62,7 @@
#include "libc/sysv/consts/prot.h"
#include "libc/sysv/consts/sig.h"
#include "libc/sysv/errfuns.h"
#include "libc/thread/itimer.internal.h"
#include "libc/thread/itimer.h"
#include "libc/thread/posixthread.internal.h"
#include "libc/thread/tls.h"
#ifdef __x86_64__
@ -189,7 +189,7 @@ static textwindows void *Malloc(size_t size) {
}
textwindows void WinMainForked(void) {
jmp_buf jb;
intptr_t jb[5];
int64_t reader;
int64_t savetsc;
uint32_t varlen;
@ -305,14 +305,14 @@ textwindows void WinMainForked(void) {
#endif
// jump back into function below
longjmp(jb, 1);
__builtin_longjmp(jb, 1);
}
textwindows int sys_fork_nt(uint32_t dwCreationFlags) {
char ok;
jmp_buf jb;
char **args;
int rc = -1;
intptr_t jb[5];
struct Proc *proc;
struct CosmoTib *tib;
char16_t pipename[64];
@ -325,7 +325,7 @@ textwindows int sys_fork_nt(uint32_t dwCreationFlags) {
return -1;
ftrace_enabled(-1);
strace_enabled(-1);
if (!setjmp(jb)) {
if (!__builtin_setjmp(jb)) {
reader = CreateNamedPipe(__create_pipe_name(pipename), kNtPipeAccessInbound,
kNtPipeTypeByte | kNtPipeReadmodeByte, 1, PIPE_BUF,
PIPE_BUF, 0, &kNtIsInheritable);
@ -467,12 +467,7 @@ textwindows int sys_fork_nt(uint32_t dwCreationFlags) {
if (ftrace_stackdigs)
_weaken(__hook)(_weaken(ftrace_hook), _weaken(GetSymbolTable)());
// reset core runtime services
__proc_wipe();
WipeKeystrokes();
if (_weaken(__sig_init))
_weaken(__sig_init)();
if (_weaken(__itimer_wipe))
_weaken(__itimer_wipe)();
// notify pthread join
atomic_store_explicit(&_pthread_static.ptid, GetCurrentThreadId(),
memory_order_release);