[Emacs-diffs] emacs-26 ca8afa7: Require a larger stack size for threads on macOS (bug#30364)

[Paul Eggert]

branch: emacs-26
commit ca8afa7672b830d6ed570c21599f3eadb0958d79
Author: Paul Eggert <address@hidden>
Commit: Paul Eggert <address@hidden>

    Require a larger stack size for threads on macOS (bug#30364)
    
    * src/systhread.c (sys_thread_create)
    [THREADS_ENABLED && HAVE_PTHREAD && DARWIN_OS]:
    Require at least 8MB stack size for x64 and 4MB for x86 on macOS.
    Do not merge to master.
---
 src/systhread.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/src/systhread.c b/src/systhread.c
index 4ffb7db..c4dcc4e 100644
--- a/src/systhread.c
+++ b/src/systhread.c
@@ -165,6 +165,15 @@ sys_thread_create (sys_thread_t *thread_ptr, const char 
*name,
   if (pthread_attr_init (&attr))
     return 0;
 
+#ifdef DARWIN_OS
+  /* Avoid crash on macOS with deeply nested GC (Bug#30364).  */
+  size_t stack_size;
+  size_t required_stack_size = sizeof (void *) * 1024 * 1024;
+  if (pthread_attr_getstacksize (&attr, &stack_size) == 0
+      && stack_size < required_stack_size)
+    pthread_attr_setstacksize (&attr, required_stack_size);
+#endif
+
   if (!pthread_attr_setdetachstate (&attr, PTHREAD_CREATE_DETACHED))
     {
       result = pthread_create (thread_ptr, &attr, func, arg) == 0;