From 8c1ab65c0f548d20b7f177bdb736daaf603340e1 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Wed, 17 Apr 2024 15:54:38 +0200 Subject: Adding upstream version 0.0~git20221206.8b7148f. Signed-off-by: Daniel Baumann --- libc-top-half/musl/src/stdio/putc.h | 29 +++++++++++++++++++++++++++++ 1 file changed, 29 insertions(+) create mode 100644 libc-top-half/musl/src/stdio/putc.h (limited to 'libc-top-half/musl/src/stdio/putc.h') 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 +} -- cgit v1.2.3