sync: atomic counters

thirdparty/stdatomic/nix/atomic.h

@@ -0,0 +1,54 @@
+/*
+    Compability header for stdatomic.h that works for all compilers supported
+    by V. For TCC the atomic features missing are implemented using mutex locks
+
+*/
+#ifndef __cplusplus
+// If C just use stdatomic.h
+#ifndef __TINYC__
+#include <stdatomic.h>
+#endif
+#else
+// CPP wrapper for atomic operations that are compatible with C
+#include "atomic_cpp.h"
+#endif
+
+#ifdef __TINYC__
+#include <pthread.h>
+
+typedef intptr_t atomic_llong;
+typedef intptr_t atomic_ullong;
+
+pthread_mutex_t lock = PTHREAD_MUTEX_INITIALIZER;
+
+/*
+    Wrapper for TCC to use mutex locks since it lacks the atomic functions
+*/
+static inline intptr_t atomic_fetch_add_explicit(intptr_t *x, size_t offset, int mo)
+{
+    pthread_mutex_lock(&lock);
+
+    intptr_t old_value = *x;
+    *x = *x + offset;
+
+    pthread_mutex_unlock(&lock);
+
+    return old_value;
+}
+
+/*
+    Wrapper for TCC to use mutex locks since it lacks the atomic functions
+*/
+static inline intptr_t atomic_fetch_sub_explicit(intptr_t *x, size_t offset, int mo)
+{
+    pthread_mutex_lock(&lock);
+
+    intptr_t old_value = *x;
+    *x = *x - offset;
+
+    pthread_mutex_unlock(&lock);
+
+    return old_value;
+}
+
+#endif