[LTP] [PATCH v5] pthread_cond_brodcast/1-2.c hung when mem left is not enough

[DAN LI <li.dan@cn.fujitsu.com>]

pthread_cond_brodcast/1-2.c try to create as many childrens(thread or
process) as possible,however,if current free memory is exhausted before
all childrens are started,the case will timeout and hung since it's
stated with program "t0".

Signed-off-by: DAN LI <li.dan@cn.fujitsu.com>
---
 .../interfaces/pthread_cond_broadcast/1-2.c        | 40 +++++++++++++++++++---
 testcases/open_posix_testsuite/include/mem_info.h  | 40 ++++++++++++++++++++++
 2 files changed, 76 insertions(+), 4 deletions(-)
 create mode 100644 testcases/open_posix_testsuite/include/mem_info.h

diff --git a/testcases/open_posix_testsuite/conformance/interfaces/pthread_cond_broadcast/1-2.c
b/testcases/open_posix_testsuite/conformance/interfaces/pthread_cond_broadcast/1-2.c
index f6ad9df..6b27f40 100644
--- a/testcases/open_posix_testsuite/conformance/interfaces/pthread_cond_broadcast/1-2.c
+++ b/testcases/open_posix_testsuite/conformance/interfaces/pthread_cond_broadcast/1-2.c
@@ -49,6 +49,7 @@
 #include <sys/wait.h>
 #include <semaphore.h>

+#include "mem_info.h"
 #include "../testfrmw/testfrmw.h"
 #include "../testfrmw/testfrmw.c"

@@ -82,8 +83,8 @@
 #endif

 /* Do not create more than this amount of children: */
-#define MAX_PROCESS_CHILDREN  (200)
-#define MAX_THREAD_CHILDREN   (1000)
+static int max_process_children  = 200;
+static int max_thread_children = 1000;

 #define TIMEOUT  (180)

@@ -243,6 +244,35 @@ void *timer(void *arg)
 	return NULL; /* For compiler */
 }

+static void children_number(void)
+{
+	struct sysinfo sysinformation;
+	int avail_number;
+	unsigned long freeram;
+	unsigned long per_process;
+	unsigned long min_stack;
+
+	min_stack = sysconf(_SC_THREAD_STACK_MIN);
+
+	freeram = getfreeram();
+	if (freeram == 0)
+		return;
+
+	per_process = min_stack * max_thread_children;
+	if (per_process > freeram)
+		UNTESTED("Not enough memory.");
+
+	avail_number = freeram / per_process;
+
+	if (avail_number < 10)
+		UNTESTED("Not enough memory.");
+
+	max_process_children = (avail_number < max_process_children ?
+					avail_number : max_process_children);
+
+	return;
+}
+
 int main(int argc, char *argv[])
 {
 	int ret;
@@ -268,6 +298,8 @@ int main(int argc, char *argv[])

 	output_init();

+	children_number();
+
 	/* check the system abilities */
 	pshared = sysconf(_SC_THREAD_PROCESS_SHARED);
 	cs = sysconf(_SC_CLOCK_SELECTION);
@@ -476,7 +508,7 @@ int main(int argc, char *argv[])
 				} else {
 					ret = errno;
 				}
-			} while ((ret == 0) && (child_count < MAX_THREAD_CHILDREN));
+			} while ((ret == 0) && (child_count < max_thread_children));
 			#if VERBOSE > 2
 			output("[parent] Created %i children threads\n", child_count);
 			#endif
@@ -504,7 +536,7 @@ int main(int argc, char *argv[])
 				} else {
 					ret = errno;
 				}
-			} while ((ret == 0) && (child_count < MAX_PROCESS_CHILDREN));
+			} while ((ret == 0) && (child_count < max_process_children));
 			#if VERBOSE > 2
 			output("[parent] Created %i children processes\n", child_count);
 			#endif
diff --git a/testcases/open_posix_testsuite/include/mem_info.h b/testcases/open_posix_testsuite/include/mem_info.h
new file mode 100644
index 0000000..1669216
--- /dev/null
+++ b/testcases/open_posix_testsuite/include/mem_info.h
@@ -0,0 +1,40 @@
+/*
+ *
+ *   Copyright (c) 2012, DAN LI
+ *
+ *   This program is free software;  you can redistribute it and/or modify
+ *   it under the terms in version 2 of the GNU General Public License as
+ *   published by the Free Software Foundation.
+ *
+ *   This program is distributed in the hope that it will be useful,
+ *   but WITHOUT ANY WARRANTY;  without even the implied warranty of
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
+ *   the GNU General Public License for more details.
+ *
+ *   You should have received a copy of the GNU General Public License
+ *   along with this program;  if not, write to the Free Software
+ *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ *
+ *   Author:  DAN LI <li.dan AT cn fujitsu com>
+ *   Date:    10/12/2012
+ */
+
+#ifdef __linux__
+#include <sys/sysinfo.h>
+
+static int getfreeram(void)
+{
+	int ret;
+	struct sysinfo sysinformation;
+
+	ret = sysinfo(&sysinformation);
+	if (ret != 0)
+		return 0;
+	return sysinformation.freeram;
+}
+#else
+static int getfreeram(void)
+{
+	return 0;
+}
+#endif
-- 
1.7.12

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