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// $Id: Process_Mutex.cpp 95466 2012-01-20 19:31:23Z johnnyw $
#include "ace/OS_NS_unistd.h"
#include "ace/Log_Msg.h"
#include "ace/Process.h"
#include "ace/Process_Mutex.h"
// Listing 1 code/ch10
class GResourceUser
{
public:
GResourceUser (ACE_Process_Mutex &mutex) : gmutex_(mutex)
{
ACE_TRACE ("GResourceUser::GResourceUser");
}
void run (void)
{
ACE_TRACE ("GResourceUser::run");
int count = 0;
while (count++ < 10)
{
int result = this->gmutex_.acquire ();
ACE_TEST_ASSERT (result == 0);
ACE_DEBUG ((LM_DEBUG,
ACE_TEXT ("(%P| %t) has the mutex\n")));
// Access Global resource
ACE_OS::sleep (1);
result = this->gmutex_.release ();
ACE_TEST_ASSERT (result == 0);
ACE_OS::sleep (1); // Give other process a chance.
}
}
private:
ACE_Process_Mutex &gmutex_;
};
// Listing 1
// Listing 0 code/ch10
int ACE_TMAIN (int argc, ACE_TCHAR *argv[])
{
if (argc > 1) // Run as the child.
{
// Create or get the global mutex.
ACE_Process_Mutex mutex ("GlobalMutex");
GResourceUser acquirer (mutex);
acquirer.run ();
}
else // Run as the parent.
{
ACE_Process_Options options;
options.command_line (ACE_TEXT ("%s a"), argv[0]);
ACE_Process processa, processb;
pid_t pida = processa.spawn (options);
pid_t pidb = processb.spawn (options);
ACE_DEBUG ((LM_DEBUG,
ACE_TEXT ("Spawned processes; pids %d:%d\n"),
pida, pidb));
if (processa.wait() == -1)
ACE_ERROR_RETURN ((LM_ERROR, ACE_TEXT ("%p\n"),
ACE_TEXT ("processa wait")), -1);
if (processb.wait() == -1)
ACE_ERROR_RETURN ((LM_ERROR, ACE_TEXT ("%p\n"),
ACE_TEXT ("processb wait")), -1);
}
return 0;
}
// Listing 0
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