mirrors/cosmopolitan
1
0
Fork 0
mirror of https://github.com/jart/cosmopolitan.git synced 2025-07-02 17:28:30 +00:00
Code Issues Projects Releases Packages Wiki Activity Actions

Make mutex calling code 10x tinier

Browse source 
Calls to lock/unlock functions are now NOPs by default. The first time
clone() is called, they get turned into CALL instructions. Doing this
caused funcctions like fputc() to shrink from 85 bytes to 45+4 bytes.
Since the ANSI solution of `(__threaded && lock())` inlines os much
superfluous binary content into functions all over the place.
This commit is contained in:
Justine Tunney 2022-06-12 19:33:42 -07:00
parent 8cdec62f5b
commit 8b72490431
32 changed files with 494 additions and 210 deletions
Download patch file Download diff file Expand all files Collapse all files

14
libc/intrin/tls.greg.c
View file

@ -59,6 +59,20 @@ privileged void *__initialize_tls(char tib[64]) {
/**
* Installs thread information block on main process.
*
* For example, to set up TLS correctly for the main thread, without
* creating any threads using `clone` (which does this automatically),
* it is sufficient to say:
*
* __attribute__((__constructor__)) static void InitTls(void) {
* static char tls[64];
* __initialize_tls(tls);
* __threaded = *(int *)(tls + 0x38) = gettid();
* *(int *)(tls + 0x3c) = __errno;
* __install_tls(tls);
* }
*
* Since that'll ensure it happens exactly once.
*/
privileged void __install_tls(char tib[64]) {
int ax, dx;