From: bruceperens <bruceperens@01035d8c-6547-0410-b346-abe4f91aad63>
Date: Tue, 21 Jan 2014 21:21:55 +0000 (+0000)
Subject: Set real-time priority. The version in source/platform/linux/scheduler.cpp
X-Git-Url: http://git.whiteaudio.com/gitweb/?a=commitdiff_plain;h=a7053c2114cad31795fef09654271a2d2ef41c22;p=freetel-svn-tracking.git

Set real-time priority. The version in source/platform/linux/scheduler.cpp
is (of course) Linux-specific.


git-svn-id: https://svn.code.sf.net/p/freetel/code@1383 01035d8c-6547-0410-b346-abe4f91aad63
---

diff --git a/freedv-server/CMakeLists.txt b/freedv-server/CMakeLists.txt
index 0460ef75..35f2369b 100644
--- a/freedv-server/CMakeLists.txt
+++ b/freedv-server/CMakeLists.txt
@@ -86,7 +86,18 @@ message(STATUS "${Param.build-type} ${Version.major}.${Version.minor}.${Version.
 #
 # Set cmake internal variables from parameters.
 #
+
+set(Compile.linux.sources
+  source/platform/linux/scheduler.cpp
+)
+
+# FIX: Add other platforms.
+if(Platform.name STREQUAL Linux)
+  set(Compile.platform.sources ${Compile.linux.sources})
+endif(Platform.name STREQUAL Linux)
+
 set(Compile.sources
+  ${Compile.platform.sources}
   source/audio_device.cpp
   source/audio_input.cpp
   source/audio_output.cpp
diff --git a/freedv-server/source/big_main.cpp b/freedv-server/source/big_main.cpp
index 74239717..b60cc0e0 100644
--- a/freedv-server/source/big_main.cpp
+++ b/freedv-server/source/big_main.cpp
@@ -182,6 +182,7 @@ main(int argc, char * * argv)
     help(argv[0]);
     exit(1);
   }
+  set_scheduler();
   return run(&i);
 }
 #endif
diff --git a/freedv-server/source/drivers.h b/freedv-server/source/drivers.h
index 25b37664..65a0a57d 100644
--- a/freedv-server/source/drivers.h
+++ b/freedv-server/source/drivers.h
@@ -17,7 +17,11 @@ namespace FreeDV {
   /// \param s The string to be copied.
   /// \return The new copy. It's the caller's responsibility to free this data,
   ///  or a memory leak will occurr.
-  char * copy_string(const char * s);
+  char *	copy_string(const char * s);
+
+  /// Set the real-time parameters in the scheduler before running our main
+  /// loop.
+  void		set_scheduler();
 
   /// Virtual base class for all driver classes.
   class Base {
diff --git a/freedv-server/source/platform/linux/.gitignore b/freedv-server/source/platform/linux/.gitignore
deleted file mode 100644
index e69de29b..00000000
diff --git a/freedv-server/source/platform/linux/scheduler.cpp b/freedv-server/source/platform/linux/scheduler.cpp
new file mode 100644
index 00000000..cd01dc49
--- /dev/null
+++ b/freedv-server/source/platform/linux/scheduler.cpp
@@ -0,0 +1,35 @@
+#include <unistd.h>
+#ifdef _POSIX_PRIORITY_SCHEDULING
+#include <errno.h>
+#include <sched.h>
+#include <cstring>
+#include <iostream>
+#endif
+#include "drivers.h"
+
+namespace FreeDV {
+  void
+  set_scheduler()
+  {
+#ifdef _POSIX_PRIORITY_SCHEDULING
+    sched_param	p;
+    int		policy = SCHED_RR;
+
+    p.sched_priority = sched_get_priority_min(policy);
+    const int result = sched_setscheduler(0, policy, &p);
+    if ( result < 0 ) {
+      if ( errno == EPERM ) {
+        std::cerr << "Insufficient privilege to set real-time priority. "
+	 "Try runing as root." << std::endl;
+      }
+      else if ( errno == EINVAL ) {
+        std::cerr << "This kernel doesn't seem to have real-time facilities. "
+         "If audio is sometimes interrupted, try a newer kernel." << std::endl;
+      }
+      else {
+        std::cerr << "sched_setscheduler: " << strerror(errno) << std::endl;
+      }
+    }
+  }
+#endif
+}
diff --git a/freedv-server/source/run.cpp b/freedv-server/source/run.cpp
index 8a893370..dfe99655 100644
--- a/freedv-server/source/run.cpp
+++ b/freedv-server/source/run.cpp
@@ -68,7 +68,7 @@ namespace FreeDV {
       else {
         receive(i);
       }
-      usleep(10000);
+      usleep(20000);
     }
   }