1 files changed, 134 insertions, 0 deletions
diff --git a/erts/emulator/sys/unix/sys_time.c b/erts/emulator/sys/unix/sys_time.c
new file mode 100644
index 0000000000..fcce54a2c4
--- /dev/null
+++ b/erts/emulator/sys/unix/sys_time.c
@@ -0,0 +1,134 @@
+/*
+ * %CopyrightBegin%
+ * 
+ * Copyright Ericsson AB 2005-2009. All Rights Reserved.
+ * 
+ * The contents of this file are subject to the Erlang Public License,
+ * Version 1.1, (the "License"); you may not use this file except in
+ * compliance with the License. You should have received a copy of the
+ * Erlang Public License along with this software. If not, it can be
+ * retrieved online at http://www.erlang.org/.
+ * 
+ * Software distributed under the License is distributed on an "AS IS"
+ * basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
+ * the License for the specific language governing rights and limitations
+ * under the License.
+ * 
+ * %CopyrightEnd%
+ */
+
+#ifdef HAVE_CONFIG_H
+#  include "config.h"
+#endif
+
+/* These need to be undef:ed to not break activation of
+ * micro level process accounting on /proc/self 
+ */
+#ifdef _LARGEFILE_SOURCE
+#  undef _LARGEFILE_SOURCE
+#endif
+#ifdef _FILE_OFFSET_BITS
+#  undef _FILE_OFFSET_BITS
+#endif
+
+#include "sys.h"
+#include "global.h"
+
+#ifdef NO_SYSCONF
+#  define TICKS_PER_SEC()	HZ
+#else
+#define TICKS_PER_SEC()	sysconf(_SC_CLK_TCK)
+#endif
+
+#ifdef HAVE_GETHRVTIME_PROCFS_IOCTL
+#  include <unistd.h>
+#  include <sys/types.h>
+#  include <sys/stat.h>
+#  include <sys/signal.h>
+#  include <sys/fault.h>
+#  include <sys/syscall.h>
+#  include <sys/procfs.h>
+#  include <fcntl.h>
+#endif
+
+/******************* Routines for time measurement *********************/
+
+int erts_ticks_per_sec = 0; /* Will be SYS_CLK_TCK in erl_unix_sys.h */
+int erts_ticks_per_sec_wrap = 0; /* Will be SYS_CLK_TCK_WRAP */
+static int ticks_bsr = 0; /* Shift wrapped tick value this much to the right */
+
+/* 
+ * init timers, chose a tick length, and return it.
+ * Unix is priviliged when it comes to time, as erl_time_sup.c 
+ * does almost everything. Other platforms have to
+ * emulate Unix in this sense.
+ */
+int sys_init_time(void)
+{
+    /* 
+     * This (erts_ticks_per_sec) is only for times() (CLK_TCK), 
+     * the resolution is always one millisecond..
+     */
+    if ((erts_ticks_per_sec = TICKS_PER_SEC()) < 0)
+	erl_exit(1, "Can't get clock ticks/sec\n");
+    if (erts_ticks_per_sec >= 1000) {
+	/* Workaround for beta linux kernels, need to be done in runtime
+	   to make erlang run on both 2.4 and 2.5 kernels. In the future, 
+	   the kernel ticks might as 
+	   well be used as a high res timer instead, but that's for when the 
+	   majority uses kernels with HZ == 1024 */
+	ticks_bsr = 3;
+    } else {
+	ticks_bsr = 0;
+    }
+    erts_ticks_per_sec_wrap = (erts_ticks_per_sec >> ticks_bsr);
+    return SYS_CLOCK_RESOLUTION;
+}
+
+clock_t sys_times_wrap(void)
+{
+    SysTimes dummy;
+    clock_t result = (sys_times(&dummy) >> ticks_bsr);
+    return result;
+}
+
+
+
+
+#ifdef HAVE_GETHRVTIME_PROCFS_IOCTL
+
+int sys_start_hrvtime(void)
+{
+    long msacct = PR_MSACCT;
+    int fd;
+
+    if ( (fd = open("/proc/self", O_WRONLY)) == -1) {
+	return -1;
+    }
+    if (ioctl(fd, PIOCSET, &msacct) < 0) {
+	close(fd);
+	return -2;
+    }
+    close(fd);
+    return 0;
+}
+
+int sys_stop_hrvtime(void)
+{
+    long msacct = PR_MSACCT;
+    int fd;
+
+    if ( (fd = open("/proc/self", O_WRONLY)) == -1) {
+	return -1;
+    }
+    if (ioctl(fd, PIOCRESET, &msacct) < 0) {
+	close(fd);
+	return -2;
+    }
+    close(fd);
+    return 0;
+}
+
+#endif /* HAVE_GETHRVTIME_PROCFS_IOCTL */
+
+