Question regarding synchronization in threads

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Linux

Hello,

See the following code:

I am having some library file like libexample.so
And in my code i am using some function X(inputbuffer , outputbuffer)present in library


/*
Assume for each thread there are corresponding input buffers and output buffers
example if there are 50 threads 50 input buffers and out buffers are available
i.e input buffers are unique to each other so as output buffers....
*/
void* threadFunX(void *num)
{
Mutex lock();
int ret = X(inputBuffer,outputbuffer,length);
if(ret)
{
//store the output buffer in afile
}
else
error occured.....
Mutex unlock();
pthread_exit(NULL);
}

int main()
{
pthread_t thread1[100];

for(i=0;i<100;i++){
p1 = pthread_create(&thread1[i],NULL,threadFunX,(void *)i);
if(p1)
printf("Error occurred while creating thread.....\n");
//pthread_join( thread1[i], NULL);
}
for(i=0;i<100;i++)
pthread_join( thread1[i], NULL);

}


My question:
If we are not using Mutex we are getting output buffer corrupted.... for this reason we are using mutex....
Is there any alternative method other than mutex....
I want to use this library function efficiently.....
My main moto is I want to reduce running time taken by mutex method also...
if my code with mutex is running with 2 seconds..... I want better alternative method which takes lesser time than mutex with thread parallel programming...

Thanks in advance...