scratch arena thread safety

gebs.h

@@ -90,6 +90,10 @@ int main(int argc, char ** argv)
 #include <string.h>
 #include <limits.h>
 
+#ifdef GEBS_ENABLE_PTHREAD_FEATURES
+#   include <pthread.h>
+#endif
+
 #include <unistd.h>
 #include <sys/stat.h>
 #include <sys/types.h>
@@ -400,6 +404,21 @@ void gebs_rebuild_self1_alloc(Gebs_Allocator *alloc, int argc, char ** argv,
     __ok; \
 })
 
+#define gebs_needs_rebuild_many_array(out, array) \
+({ \
+    bool __ok = false; \
+    if (sizeof((array))/sizeof((array)[0]) == 0) { \
+        __ok = true; \
+    } \
+    for (size_t __i = 0; __i < sizeof((array))/sizeof((array)[0]); __i++) { \
+        if (gebs_needs_rebuild((out), (array)[__i])) { \
+            __ok = true; \
+            break; \
+        } \
+    } \
+    __ok; \
+})
+
 #define gebs_make_compile_flags(...) \
     do { \
         if (gebs_needs_rebuild("compile_flags.txt", __FILE__)) { \
@@ -419,12 +438,20 @@ void gebs_rebuild_self1_alloc(Gebs_Allocator *alloc, int argc, char ** argv,
     } while(0)
 
 #define GEBS_RULE(target, ...) if (needs_rebuild_many(target, __VA_ARGS__))
+#define GEBS_RULE_ARRAY(target, array) if (gebs_needs_rebuild_many_array(target, (array)))
 
 // ----------------------------------------------------------------------------
 // Scratch arena
 // ----------------------------------------------------------------------------
 
-extern Gebs_Arena gebs_scratch_arena;
+typedef struct {
+    Gebs_Arena value;
+    #ifdef GEBS_ENABLE_PTHREAD_FEATURES
+        pthread_mutex_t lock;
+    #endif
+} Gebs_Scratch_Arena;
+
+extern Gebs_Scratch_Arena gebs_scratch_arena;
 
 void gebs_scratch_arena_reset(void);
 char *gebs_fmt(const char *fmt, ...);
@@ -800,22 +827,25 @@ void gebs_arena_destroy(Gebs_Arena *a)
 // Scratch arena
 // ----------------------------------------------------------------------------
 
-Gebs_Arena gebs_scratch_arena;
+Gebs_Scratch_Arena gebs_scratch_arena;
 
 __attribute__((constructor))
 void gebs_scratch_areana_init(void)
 {
-    gebs_scratch_arena = gebs_arena_get();
+    gebs_scratch_arena.value = gebs_arena_get();
 }
 
 __attribute__((destructor))
 void gebs_scratch_areana_free(void)
 {
-    gebs_arena_destroy(&gebs_scratch_arena);
+    gebs_arena_destroy(&gebs_scratch_arena.value);
 }
 
 char *gebs_fmt(const char *fmt, ...)
 {
+    #ifdef GEBS_ENABLE_PTHREAD_FEATURES
+        pthread_mutex_lock(&gebs_scratch_arena.lock);
+    #endif
     va_list list;
     va_start(list, fmt);
 
@@ -824,23 +854,41 @@ char *gebs_fmt(const char *fmt, ...)
     size_t size = vsnprintf(nil, 0, fmt, list_copy);
     va_end(list_copy);
 
-    char *buf = gebs_malloc(&gebs_scratch_arena, size+1);
+    char *buf = gebs_malloc(&gebs_scratch_arena.value, size+1);
     vsprintf(buf, fmt, list);
     va_end(list);
+    #ifdef GEBS_ENABLE_PTHREAD_FEATURES
+        pthread_mutex_unlock(&gebs_scratch_arena.lock);
+    #endif
     return buf;
 }
 
 void gebs_scratch_arena_reset(void)
 {
-    gebs_arena_reset(&gebs_scratch_arena);
+    #ifdef GEBS_ENABLE_PTHREAD_FEATURES
+        pthread_mutex_lock(&gebs_scratch_arena.lock);
+    #endif
+    gebs_arena_reset(&gebs_scratch_arena.value);
+    #ifdef GEBS_ENABLE_PTHREAD_FEATURES
+        pthread_mutex_unlock(&gebs_scratch_arena.lock);
+    #endif
 }
 
 char *gebs_cwd(void)
 {
-    char *cwd = gebs_malloc(&gebs_scratch_arena, PATH_MAX);
+    #ifdef GEBS_ENABLE_PTHREAD_FEATURES
+        pthread_mutex_lock(&gebs_scratch_arena.lock);
+    #endif
+    char *cwd = gebs_malloc(&gebs_scratch_arena.value, PATH_MAX);
     if (getcwd(cwd, PATH_MAX) == nil) {
+        #ifdef GEBS_ENABLE_PTHREAD_FEATURES
+            pthread_mutex_unlock(&gebs_scratch_arena.lock);
+        #endif
         return nil;
     }
+    #ifdef GEBS_ENABLE_PTHREAD_FEATURES
+        pthread_mutex_unlock(&gebs_scratch_arena.lock);
+    #endif
     return cwd;
 }
 
@@ -971,6 +1019,7 @@ void gebs_rebuild_self1_alloc(Gebs_Allocator *alloc, int argc, char ** argv,
 #define sb_finish                   gebs_sb_finish
 #define sb_append_nstr              gebs_sb_append_nstr
 #define sb_read_file                gebs_sb_read_file
+#define sb_read_file_alloc          gebs_sb_read_file_alloc
 
 #define rename1                     gebs_rename
 #define remove1                     gebs_remove
@@ -979,7 +1028,7 @@ void gebs_rebuild_self1_alloc(Gebs_Allocator *alloc, int argc, char ** argv,
 
 #define Cmd                         Gebs_Cmd
 #define cmd_append_alloc            gebs_cmd_append_alloc
-#define cmd_free_aloc               gebs_cmd_free_alloc
+#define cmd_free_alloc              gebs_cmd_free_alloc
 #define cmd_append                  gebs_cmd_append
 #define cmd_free                    gebs_cmd_free
 #define cmd_run_alloc               gebs_cmd_run_alloc
@@ -1003,6 +1052,7 @@ void gebs_rebuild_self1_alloc(Gebs_Allocator *alloc, int argc, char ** argv,
 #define rebuild_self                gebs_rebuild_self
 #define make_compile_flags          gebs_make_compile_flags
 #define RULE                        GEBS_RULE
+#define RULE_ARRAY                  GEBS_RULE_ARRAY
 
 #define scratch_arena               gebs_scratch_arena
 #define fmt                         gebs_fmt