cosmopolitan/libc/intrin/once.h

#ifndef COSMOPOLITAN_LIBC_INTRIN_ONCE_H_
#define COSMOPOLITAN_LIBC_INTRIN_ONCE_H_
#include "libc/intrin/spinlock.h"

#define _once(x)                      \
  ({                                  \
    typeof(x) oncerc;                 \
    static bool once;                 \
    static typeof(oncerc) onceresult; \
    _Alignas(64) static int oncelock; \
    _spinlock(&oncelock);             \
    if (once) {                       \
      oncerc = onceresult;            \
    } else {                          \
      oncerc = onceresult = x;        \
    }                                 \
    _spunlock(&oncelock);             \
    oncerc;                           \
  })

#endif /* COSMOPOLITAN_LIBC_INTRIN_ONCE_H_ */
Fix bugs and make improvements - Get clone() working on FreeBSD - Increase some Python build quotas - Add more atomic builtins to chibicc - Fix ASAN poisoning of alloca() memory - Make MODE= mandatory link path tinier - Improve the examples folder a little bit - Start working on some more resource limits - Make the linenoise auto-complete UI as good as GNU readline - Update compile.com, avoiding AVX codegen on non-AVX systems - Make sure empty path to syscalls like opendir raises ENOENT - Correctly polyfill ENOENT vs. ENOTDIR on the New Technology - Port bestline's paredit features to //third_party/linenoise - Remove workarounds for RHEL 5.0 bugs that were fixed in 5.1 2022-04-20 16:56:53 +00:00			`#ifndef COSMOPOLITAN_LIBC_INTRIN_ONCE_H_`
			`#define COSMOPOLITAN_LIBC_INTRIN_ONCE_H_`
			`#include "libc/intrin/spinlock.h"`

Fix many thread and file descriptor issues on Windows The greenbean web server now works nearly perfectly on Windows with over 1000 threads. But some synchronization issues still remain which prevent us from going over nine thousand. 2022-05-21 01:51:41 +00:00			`#define _once(x) \`
			`({ \`
			`typeof(x) oncerc; \`
			`static bool once; \`
			`static typeof(oncerc) onceresult; \`
			`_Alignas(64) static int oncelock; \`
			`_spinlock(&oncelock); \`
			`if (once) { \`
			`oncerc = onceresult; \`
			`} else { \`
			`oncerc = onceresult = x; \`
			`} \`
			`_spunlock(&oncelock); \`
			`oncerc; \`
Fix bugs and make improvements - Get clone() working on FreeBSD - Increase some Python build quotas - Add more atomic builtins to chibicc - Fix ASAN poisoning of alloca() memory - Make MODE= mandatory link path tinier - Improve the examples folder a little bit - Start working on some more resource limits - Make the linenoise auto-complete UI as good as GNU readline - Update compile.com, avoiding AVX codegen on non-AVX systems - Make sure empty path to syscalls like opendir raises ENOENT - Correctly polyfill ENOENT vs. ENOTDIR on the New Technology - Port bestline's paredit features to //third_party/linenoise - Remove workarounds for RHEL 5.0 bugs that were fixed in 5.1 2022-04-20 16:56:53 +00:00			`})`

			`#endif /* COSMOPOLITAN_LIBC_INTRIN_ONCE_H_ */`