[libc-commits] [libc] [libc] implement localtime (PR #110363)

[Petr Hosek via libc-commits]

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In-Reply-To: <llvm.org/llvm/llvm-project/pull/110363 at github.com>


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@@ -26,6 +31,26 @@ static int64_t computeRemainingYears(int64_t daysPerYears,
   return years;
 }
 
+volatile int file_usage = 0;
+
+void release_file(FILE *fp, char *timezone) {
+  file_usage = 0;
+  fclose(fp);
+}
+
+void acquire_file(FILE *fp, char *timezone, size_t timezone_size) {
+  while (1) {
+    if (file_usage == 0) {
+      file_usage = 1;
+      break;
+    }
+  }
+
+  if (fgets(timezone, (int)timezone_size, fp) == NULL) {
+    release_file(fp, timezone);
+  }
+}
----------------
petrhosek wrote:

The file related logic should ideally be wrapped in an RAII type to make sure the file is always closed.

https://github.com/llvm/llvm-project/pull/110363