From 90dad97fc07f049383903a166631e2c257f9b8c1 Mon Sep 17 00:00:00 2001 From: Kacper Date: Tue, 16 Dec 2025 17:02:05 +0100 Subject: Add support for TLS in the libc --- lib/libc/internal/include/atomic.h | 23 +++++++++++++++++++++++ 1 file changed, 23 insertions(+) create mode 100644 lib/libc/internal/include/atomic.h (limited to 'lib/libc/internal/include/atomic.h') diff --git a/lib/libc/internal/include/atomic.h b/lib/libc/internal/include/atomic.h new file mode 100644 index 00000000..e0593021 --- /dev/null +++ b/lib/libc/internal/include/atomic.h @@ -0,0 +1,23 @@ +#ifndef __LIBC_ATOMIC_H +#define __LIBC_ATOMIC_H + +#include + +#define LIBC_LOCK(__lock) __libc_lock(&((__lock))) +#define LIBC_UNLOCK(__lock) atomic_flag_clear(&((__lock))) + +static __inline void __libc_lock(volatile atomic_flag *lock) +{ + while (atomic_flag_test_and_set_explicit(lock, memory_order_acquire)) { + unsigned int spins = 1; + do { + for (unsigned int i = 0; i < spins; i++) + __asm__ volatile("pause"); + if (spins < 64) + spins *= 2; + } while (atomic_flag_test_and_set_explicit( + lock, memory_order_relaxed)); + } +} + +#endif -- cgit v1.2.3