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Simplify TLS and reduce startup latency

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This change simplifies the thread-local storage support code. On Windows
and Mac OS X the startup latency of __enable_tls() has been reduced from
30ms to 1ms. On Windows, TLS memory accesses will now go much faster due
to better self-modifying code that prevents a function call and acquires
our thread information block pointer in a single instruction.
This commit is contained in:
Justine Tunney 2022-07-18 03:33:32 -07:00
parent 38c3fa63fe
commit b1d9d11be1
15 changed files with 136 additions and 312 deletions
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2
libc/thread/spawn.c
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@ -107,7 +107,7 @@ int _spawn(int fun(void *, int), void *arg, struct spawn *opt_out_thread) {
CLONE_VM | CLONE_THREAD | CLONE_FS | CLONE_FILES | CLONE_SIGHAND |
CLONE_SETTLS | CLONE_PARENT_SETTID | CLONE_CHILD_SETTID |
CLONE_CHILD_CLEARTID,
arg, &th->ptid, th->tib, _TIBZ, th->ctid) == -1) {
arg, &th->ptid, th->tib, th->ctid) == -1) {
_freestack(th->stk);
free(th->tls);
return -1;