[mono/driver] On OSX, increase the number of file handles available.mono-4.2.2.10

We just reverted a patch that prevented the FileSystemWatcher from
opening too many file descriptors (200).  That was a band-aid at one
of the spots that opened too many file, as we would exhaust the number
of files, and later abort when some other operation needed files.

The problem is that OSX defaults to 256 file descriptors, and .NET
applications are file descriptor hungry, in fact, many applications
increase their file handled limit before starting.

This patch on OSX will attempt to increase the number of handles
available to 1024 if the number of handles avaialble is less than
that.

The commit that removed the limit was:

2af882232ce4961fdbe1ba0ae36246456bb1fbfb

And it was closed to fix:

Conflicts:
	mono/mini/driver.c

1 files changed, 27 insertions, 0 deletions

diff --git a/mono/mini/driver.c b/mono/mini/driver.c
index 884d4a82ae9..0cc353cfca7 100644
--- a/mono/mini/driver.c
+++ b/mono/mini/driver.c
@@ -58,6 +58,9 @@
 #include <locale.h>
 #include "version.h"
 #include "debugger-agent.h"
+#if TARGET_OSX
+#   include <sys/resource.h>
+#endif
 
 static FILE *mini_stats_fd;
 
@@ -1462,6 +1465,26 @@ switch_gc (char* argv[], const char* target_gc)
 #endif
 }
 
+#ifdef TARGET_OSX
+
+/*
+ * tries to increase the minimum number of files, if the number is below 1024
+ */
+static void
+darwin_change_default_file_handles ()
+{
+	struct rlimit limit;
+	
+	if (getrlimit (RLIMIT_NOFILE, &limit) == 0){
+		if (limit.rlim_cur < 1024){
+			limit.rlim_cur = MAX(1024,limit.rlim_cur);
+			setrlimit (RLIMIT_NOFILE, &limit);
+		}
+	}
+}
+
+#endif
+
 /**
  * mono_main:
  * @argc: number of arguments in the argv array
@@ -1514,6 +1537,10 @@ mono_main (int argc, char* argv[])
 
 	setlocale (LC_ALL, "");
 
+#if TARGET_OSX
+	darwin_change_default_file_handles ();
+#endif
+	
 	if (g_getenv ("MONO_NO_SMP"))
 		mono_set_use_smp (FALSE);