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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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2
libc/proc/proc.internal.h
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@ -41,7 +41,6 @@ struct Procs {
extern struct Procs __proc;
void __proc_wipe(void) libcesque;
void __proc_lock(void) libcesque;
void __proc_unlock(void) libcesque;
int64_t __proc_handle(int) libcesque;
@ -49,6 +48,7 @@ int64_t __proc_search(int) libcesque;
struct Proc *__proc_new(void) libcesque;
void __proc_add(struct Proc *) libcesque;
void __proc_free(struct Proc *) libcesque;
void __proc_wipe_and_reset(void) libcesque;
int __proc_harvest(struct Proc *, bool) libcesque;
int sys_wait4_nt(int, int *, int, struct rusage *) libcesque;