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| author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-17 13:54:38 +0000 |
|---|---|---|
| committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-17 13:54:38 +0000 |
| commit | 8c1ab65c0f548d20b7f177bdb736daaf603340e1 (patch) | |
| tree | df55b7e75bf43f2bf500845b105afe3ac3a5157e /libc-top-half/musl/src/stdio/putc.h | |
| parent | Initial commit. (diff) | |
| download | wasi-libc-8c1ab65c0f548d20b7f177bdb736daaf603340e1.tar.xz wasi-libc-8c1ab65c0f548d20b7f177bdb736daaf603340e1.zip | |
Adding upstream version 0.0~git20221206.8b7148f.upstream/0.0_git20221206.8b7148f
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'libc-top-half/musl/src/stdio/putc.h')
| -rw-r--r-- | libc-top-half/musl/src/stdio/putc.h | 29 |
1 files changed, 29 insertions, 0 deletions
diff --git a/libc-top-half/musl/src/stdio/putc.h b/libc-top-half/musl/src/stdio/putc.h new file mode 100644 index 0000000..2cc63d2 --- /dev/null +++ b/libc-top-half/musl/src/stdio/putc.h @@ -0,0 +1,29 @@ +#include "stdio_impl.h" +#if defined(__wasilibc_unmodified_upstream) || defined(_REENTRANT) +#include "pthread_impl.h" + +#ifdef __GNUC__ +__attribute__((__noinline__)) +#endif +static int locking_putc(int c, FILE *f) +{ + if (a_cas(&f->lock, 0, MAYBE_WAITERS-1)) __lockfile(f); + c = putc_unlocked(c, f); + if (a_swap(&f->lock, 0) & MAYBE_WAITERS) + __wake(&f->lock, 1, 1); + return c; +} +#endif + +static inline int do_putc(int c, FILE *f) +{ +#if defined(__wasilibc_unmodified_upstream) || defined(_REENTRANT) + int l = f->lock; + if (l < 0 || l && (l & ~MAYBE_WAITERS) == __pthread_self()->tid) + return putc_unlocked(c, f); + return locking_putc(c, f); +#else + // With no threads, locking is unnecessary. + return putc_unlocked(c, f); +#endif +} |