[LTP] [PATCH v2] pthread_cond_brodcast/1-2.c hung when mem left is not enough

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

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

Signed-off-by: DAN LI <li.dan@cn.fujitsu.com>
---
  .../interfaces/pthread_cond_broadcast/1-2.c        |   39 ++++++++++++++++++--
  1 files changed, 35 insertions(+), 4 deletions(-)

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..a31dc2b 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
@@ -48,6 +48,7 @@
  #include <sys/mman.h>
  #include <sys/wait.h>
  #include <semaphore.h>
+#include <sys/sysinfo.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)
  
@@ -242,6 +243,34 @@ void *timer(void *arg)
  	FAILED_KILLALL("Operation timed out. A signal was lost.");
  	return NULL; /* For compiler */
  }
+static int decide_process_children_count(void)
+{
+	struct sysinfo sysinforma;
+	int ret;
+	int avail_count;
+	unsigned long memper;
+	unsigned long min_stack;
+
+	min_stack = sysconf(_SC_THREAD_STACK_MIN);
+
+	ret = sysinfo(&sysinforma);
+	if (ret != 0)
+		UNRESOLVED(ret, "Failed to get system infomation.");
+
+	memper = min_stack * max_thread_children;
+	if (memper > sysinforma.freeram)
+		UNTESTED("Free ram not enough for test.");
+
+	avail_count = sysinforma.freeram / memper;
+
+	if (avail_count < 10)
+		UNTESTED("Free ram not enough for test.");
+
+	max_process_children = (avail_count < max_process_children ?
+					avail_count : max_process_children);
+
+	return 0;
+}
  
  int main(int argc, char *argv[])
  {
@@ -268,6 +297,8 @@ int main(int argc, char *argv[])
  
  	output_init();
  
+	decide_process_children_count();
+
  	/* check the system abilities */
  	pshared = sysconf(_SC_THREAD_PROCESS_SHARED);
  	cs = sysconf(_SC_CLOCK_SELECTION);
@@ -476,7 +507,7 @@ 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 +535,7 @@ 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
-- 
1.7.7.6


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