utils.h: Set lower bound for thread stack size to PTHREAD_STACK_MIN

ASTERISK-28590 #close

Change-Id: I51abce00c04d0a06550bda5205580705185b9c1c

include/asterisk/utils.h

@@ -423,8 +423,13 @@ int ast_careful_fwrite(FILE *f, int fd, const char *s, size_t len, int timeoutms
  * Thread management support (should be moved to lock.h or a different header)
  */
 
-#define AST_STACKSIZE     (((sizeof(void *) * 8 * 8) - 16) * 1024)
-#define AST_STACKSIZE_LOW (((sizeof(void *) * 8 * 2) - 16) * 1024)
+#if defined(PTHREAD_STACK_MIN)
+# define AST_STACKSIZE     MAX((((sizeof(void *) * 8 * 8) - 16) * 1024), PTHREAD_STACK_MIN)
+# define AST_STACKSIZE_LOW MAX((((sizeof(void *) * 8 * 2) - 16) * 1024), PTHREAD_STACK_MIN)
+#else
+# define AST_STACKSIZE     (((sizeof(void *) * 8 * 8) - 16) * 1024)
+# define AST_STACKSIZE_LOW (((sizeof(void *) * 8 * 2) - 16) * 1024)
+#endif
 
 int ast_background_stacksize(void);