[PATCH 16/22] Coarray caf_shmem final patch set

From 8c9507475be905ae8ee927a0cb8d5b11e56844aa Mon Sep 17 00:00:00 2001
From: Jerry DeLisle <[email protected]>
Date: Sat, 14 Feb 2026 15:46:44 -0800
Subject: [PATCH] Fortran: Adjust test to work with multiple images.

The testcase would fail occasionally with multiple images because the
use of acquired_lock is a non-blocking LOCK. Only UNLOCK this if the
LOCK was acquired. Keep track of the loop count and bail out if the
limit is reached.

During testing it was observed that the loop count could go as high as
33 times depending on system conditions, running the test outside the
testsuite 1000's of times.

	PR fortran/121429

gcc/testsuite/ChangeLog:

	* gfortran.dg/coarray/lock_1.f90: Updated.
---
 gcc/testsuite/gfortran.dg/coarray/lock_1.f90 | 18 +++++++++++-------
 1 file changed, 11 insertions(+), 7 deletions(-)

diff --git a/gcc/testsuite/gfortran.dg/coarray/lock_1.f90 b/gcc/testsuite/gfortran.dg/coarray/lock_1.f90
index 1ec5984a4d3..d990fd3f908 100644
--- a/gcc/testsuite/gfortran.dg/coarray/lock_1.f90
+++ b/gcc/testsuite/gfortran.dg/coarray/lock_1.f90
@@ -4,12 +4,12 @@
 !
 ! PR fortran/18918
 !
-
 use iso_fortran_env
 implicit none
 
 type(lock_type) :: lock[*]
 integer :: stat
+integer :: counter
 logical :: acquired
 
 LOCK(lock)
@@ -18,15 +18,19 @@ UNLOCK(lock)
 stat = 99
 LOCK(lock, stat=stat)
 if (stat /= 0) STOP 1
+
 stat = 99
 UNLOCK(lock, stat=stat)
 if (stat /= 0) STOP 2
 
-if (this_image() == 1) then
-  acquired = .false.
+acquired = .false.
+counter = 0
+do while (.not. acquired)
+  counter = counter + 1
   LOCK (lock[this_image()], acquired_lock=acquired)
-  if (.not. acquired) STOP 3
-  UNLOCK (lock[1])
-end if
+  if (acquired) UNLOCK (lock)
+  if ((num_images() .eq. 8) .and. (counter .gt. 100)) exit
+end do
+! counter here can vary depending on conditions, picked 100.
+if (counter .gt. 100) stop counter
 end
-
-- 
2.53.0