Changeset b05530c4ff96e00046ae4e9555794b66265081b2

Timestamp:

07/11/09 12:23:28 (3 years ago)

Author:

Nedko Arnaudov <nedko@…>

Children:

97022e24935605949cb7664b5d9193ed7c1c499c

Parents:

51bb400466101d3a545817ba7e27f9d25568ab51

git-committer:

Nedko Arnaudov <nedko@arnaudov.name> / 2009-07-11T12:23:28Z+0300

Message:

fork/vfork time measure and easy switch

Files:

• lv2_ui.c (modified) (6 diffs)

lv2_ui.c

@@ -26 +26 @@
 #define UI_URI        "http://nedko.aranaudov.org/soft/filter/2/gui"
 
+//#define FORK_TIME_MEASURE
+#define USE_VFORK
+
+#if defined(USE_VFORK)
+#define FORK vfork
+#define FORK_STR "vfork"
+#else
+#define FORK fork
+#define FORK_STR "fork"
+#endif
+
+
 #include <stdbool.h>
 #include <stdio.h>
@@ -32 +44 @@
 
 #include <sys/types.h>
+#if defined(FORK_TIME_MEASURE)
+# include <sys/time.h>
+#endif
 #include <unistd.h>
 #include <fcntl.h>
@@ -182 +197 @@
 #undef control_ptr
 
+#if defined(FORK_TIME_MEASURE)
+static
+uint64_t
+get_current_time()
+{
+   struct timeval time;
+
+   if (gettimeofday(&time, NULL) != 0)
+       return 0;
+
+   return (uint64_t)time.tv_sec * 1000000 + (uint64_t)time.tv_usec;
+}
+
+#define FORK_TIME_MEASURE_VAR_NAME  ____t
+
+#define FORK_TIME_MEASURE_VAR       uint64_t FORK_TIME_MEASURE_VAR_NAME
+#define FORK_TIME_MEASURE_BEGIN     FORK_TIME_MEASURE_VAR_NAME = get_current_time()
+#define FORK_TIME_MEASURE_END(msg)                                                       \
+  {                                                                                      \
+    FORK_TIME_MEASURE_VAR_NAME = get_current_time() - FORK_TIME_MEASURE_VAR_NAME;        \
+    fprintf(stderr, msg ": %llu us\n", (unsigned long long)FORK_TIME_MEASURE_VAR_NAME);  \
+  }
+
+#else
+
+#define FORK_TIME_MEASURE_VAR
+#define FORK_TIME_MEASURE_BEGIN
+#define FORK_TIME_MEASURE_END(msg)
+
+#endif
+
 static
 LV2UI_Handle
@@ -201 +247 @@
   char ui_send_pipe[100];
   int oldflags;
+  FORK_TIME_MEASURE_VAR;
 
   //printf("instantiate('%s', '%s') called\n", plugin_uri, bundle_path);
@@ -259 +306 @@
   control_ptr->visible = false;
 
-  switch (vfork())
+  FORK_TIME_MEASURE_BEGIN;
+
+  switch (FORK())
   {
   case 0:                       /* child process */
     /* fork duplicated the handles, close pipe ends that are used by parent process */
+#if !defined(USE_VFORK)
     /* it looks we cant do this for vfork() */
-    //close(pipe1[1]);
-    //close(pipe2[0]);
+    close(pipe1[1]);
+    close(pipe2[0]);
+#endif
 
     execlp(
@@ -284 +335 @@
   }
 
+  FORK_TIME_MEASURE_END(FORK_STR "() time");
+
   /* fork duplicated the handles, close pipe ends that are used by the child process */
   close(pipe1[0]);