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Make mutex calling code 10x tinier

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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
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7
libc/stdio/fflush.internal.h
View file

@ -1,5 +1,6 @@
#ifndef COSMOPOLITAN_LIBC_STDIO_FFLUSH_H_
#define COSMOPOLITAN_LIBC_STDIO_FFLUSH_H_
#include "libc/intrin/nopl.h"
#include "libc/intrin/pthread.h"
#include "libc/stdio/stdio.h"
#if !(__ASSEMBLER__ + __LINKER__ + 0)
@ -19,8 +20,14 @@ hidden extern struct StdioFlush __fflush;
void __fflush_lock(void);
void __fflush_unlock(void);
#if defined(__GNUC__) && !defined(__llvm__) && !defined(__STRICT_ANSI__)
#define __fflush_lock() _NOPL0("__threadcalls", __fflush_lock)
#define __fflush_unlock() _NOPL0("__threadcalls", __fflush_unlock)
#else
#define __fflush_lock() (__threaded ? __fflush_lock() : 0)
#define __fflush_unlock() (__threaded ? __fflush_unlock() : 0)
#endif
COSMOPOLITAN_C_END_
#endif /* !(__ASSEMBLER__ + __LINKER__ + 0) */