// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.

/*============================================================
**
** Source : test.c
**
** Purpose: InterlockedDecrement() function
**
**	The test case spawns MAX_THREADS Threads, and each thread call InterlockedDecrement Function to decrement a 
**	global counter REPEAT_COUNT Times. The Test case sets the global counter to MAX_THREADS * REPEAT_COUNT 
**	at the begining of the test.  The test cases passes if at the end the test the value of the global counter is Zero.
**
**
**=========================================================*/

#include <palsuite.h>
#define MAX_THREADS 64
#define REPEAT_COUNT 10000

LONG GlobalCounter = 0;
void DecrementCounter(void);

int __cdecl main(int argc, char *argv[]) 
{

	LONG TotalOperations=0;
	int i=0;
	DWORD dwThreadID = 0;
	HANDLE hThread[MAX_THREADS];
	TotalOperations = MAX_THREADS * REPEAT_COUNT;
	GlobalCounter = TotalOperations;

    /*
     * Initialize the PAL and return FAILURE if this fails
     */
    if(0 != (PAL_Initialize(argc, argv)))
    {
        return FAIL;
    }

	//Create MAX_THREADS threads that will operate on the global counter
	for (i=0;i<MAX_THREADS;i++)
	{
		hThread[i] = CreateThread( 
			NULL,                        // default security attributes 
			0,                           // use default stack size  
			(LPTHREAD_START_ROUTINE) DecrementCounter,                  // thread function 
			NULL,                // argument to thread function 
			0,                           // use default creation flags 
			&dwThreadID);                // returns the thread identifier 

		// Check the return value for success. 

		if (hThread[i] == NULL) 
		{
			Fail("ERROR: Was not able to create thread\n"
           				"GetLastError returned %d\n", GetLastError());
		}
	}

	//Wait for all threads to finish
	for (i=0;i<MAX_THREADS;i++)
	{
		if (WAIT_OBJECT_0 != WaitForSingleObject (hThread[i], INFINITE))
 		{
	 		Fail ("Main: Wait for Single Object failed.  Failing test.\n"
		       "GetLastError returned %d\n", GetLastError());  
 		}
	}

	/* Compare the value of  global counter with zero.  
    */
	if (0!=GlobalCounter)
	{
		Fail("Test Case Failed: InterlockedDecrement \n");
	}

	PAL_Terminate();
    return PASS; 
} 

void DecrementCounter(void)
{
	int i=0;
	for (i=0; i<REPEAT_COUNT;i++)
	{
		InterlockedDecrement(&GlobalCounter);
	}
}