1 files changed, 122 insertions, 0 deletions
diff --git a/test/unit/test_fork.c b/test/unit/test_fork.c
new file mode 100644
index 00000000..181c1121
--- /dev/null
+++ b/test/unit/test_fork.c
@@ -0,0 +1,122 @@
+/******************************************************************************
+ *
+ * Project:  PROJ
+ * Purpose:  Test behavior of database access across fork()
+ * Author:   Even Rouault <even dot rouault at spatialys dot com>
+ *
+ ******************************************************************************
+ * Copyright (c) 2021, Even Rouault <even dot rouault at spatialys dot com>
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included
+ * in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+ * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ ****************************************************************************/
+
+#if defined(_WIN32) && defined(MUTEX_pthread)
+#undef MUTEX_pthread
+#endif
+
+#ifdef MUTEX_pthread
+
+#include <unistd.h>
+#include <sys/types.h>
+#include <sys/wait.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+#include "proj.h"
+
+int main()
+{
+    PJ_CONTEXT* ctxt = proj_context_create();
+    PJ_CONTEXT* ctxt2 = proj_context_create();
+
+    /* Cause database initialization */
+    {
+        PJ* P = proj_create(ctxt, "EPSG:4326");
+        if( P == NULL )
+        {
+            proj_context_destroy(ctxt);
+            return 1;
+        }
+        proj_destroy(P);
+    }
+    {
+        PJ* P = proj_create(ctxt2, "EPSG:4326");
+        if( P == NULL )
+        {
+            proj_context_destroy(ctxt);
+            proj_context_destroy(ctxt2);
+            return 1;
+        }
+        proj_destroy(P);
+    }
+
+    for(int iters = 0; iters < 100; ++iters )
+    {
+        pid_t children[4];
+        for( int i = 0; i< 4; i++ )
+        {
+            children[i] = fork();
+            if( children[i] < 0 )
+            {
+                fprintf(stderr, "fork() failed\n");
+                return 1;
+            }
+            if( children[i] == 0 )
+            {
+                {
+                    PJ* P = proj_create(ctxt, "EPSG:3067");
+                    if( P == NULL )
+                        _exit(1);
+                    proj_destroy(P);
+                }
+                {
+                    PJ* P = proj_create(ctxt2, "EPSG:32631");
+                    if( P == NULL )
+                        _exit(1);
+                    proj_destroy(P);
+                }
+                _exit(0);
+            }
+        }
+        for( int i = 0; i< 4; i++ )
+        {
+            int status = 0;
+            waitpid(children[i], &status, 0);
+            if( status != 0 )
+            {
+                fprintf(stderr, "Error in child\n");
+                return 1;
+            }
+        }
+    }
+
+    proj_context_destroy(ctxt);
+    proj_context_destroy(ctxt2);
+
+    return 0;
+}
+
+#else
+
+int main()
+{
+    return 0;
+}
+
+#endif