Import BSDDB 4.7.25 (as of svn r89086)

os/os_pid.c

@@ -0,0 +1,63 @@
+/*-
+ * See the file LICENSE for redistribution information.
+ *
+ * Copyright (c) 2001,2008 Oracle.  All rights reserved.
+ *
+ * $Id: os_pid.c 63573 2008-05-23 21:43:21Z trent.nelson $
+ */
+
+#include "db_config.h"
+
+#include "db_int.h"
+
+#ifdef HAVE_MUTEX_SUPPORT
+#include "dbinc/mutex_int.h"		/* Required to load appropriate
+					   header files for thread functions. */
+#endif
+
+/*
+ * __os_id --
+ *	Return the current process ID.
+ *
+ * PUBLIC: void __os_id __P((DB_ENV *, pid_t *, db_threadid_t*));
+ */
+void
+__os_id(dbenv, pidp, tidp)
+	DB_ENV *dbenv;
+	pid_t *pidp;
+	db_threadid_t *tidp;
+{
+	/*
+	 * We can't depend on dbenv not being NULL, this routine is called
+	 * from places where there's no DB_ENV handle.
+	 *
+	 * We cache the pid in the ENV handle, getting the process ID is a
+	 * fairly slow call on lots of systems.
+	 */
+	if (pidp != NULL) {
+		if (dbenv == NULL) {
+#if defined(HAVE_VXWORKS)
+			*pidp = taskIdSelf();
+#else
+			*pidp = getpid();
+#endif
+		} else
+			*pidp = dbenv->env->pid_cache;
+	}
+
+	if (tidp != NULL) {
+#if defined(DB_WIN32)
+		*tidp = GetCurrentThreadId();
+#elif defined(HAVE_MUTEX_UI_THREADS)
+		*tidp = thr_self();
+#elif defined(HAVE_MUTEX_SOLARIS_LWP) || \
+	defined(HAVE_MUTEX_PTHREADS) || defined(HAVE_PTHREAD_API)
+		*tidp = pthread_self();
+#else
+		/*
+		 * Default to just getpid.
+		 */
+		*tidp = 0;
+#endif
+	}
+}