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+Author: Johan Hanssen Seferidis
+Created: 2011-08-12
+Updated: 2011-11-07
+
+
+
+
+=================================== Compiling =====================================
+The library is not precompiled so you have to compile it with your project. The thread pool
+uses POSIX threads so if you compile with gcc you have to use the flag -pthread like this:
+
+ gcc main.c thpool.c -pthread -o test
+
+
+Then run the executable like this:
+
+ ./test
+
+
+
+====================================== Usage ======================================
+
+1. Make a thread pool: thpool_t* thpool;
+2. Initialise the thread pool with number
+ of threads(workers) you want: thpool=thpool_init(4);
+3. Add work to the pool: thpool_add_work(thpool, (void*)doSth, (void*)arg);
+4. Destroy pool: thpool_destroy(thpool);
+
+
+
+
+
+=============================== Threadpool Interface ===============================
+
+
+NAME
+ thpool_t* thpool_init(int num_of_threads);
+
+SYNOPSIS
+
+ #include <thpool.h>
+
+ thpool_t* thpool_init(int num_of_threads);
+
+DESCRIPTION
+
+ Initialises the threadpool. On success a threadpool structure is returned. Otherwise if memory could not be allocated NULL is returned. The argument which is the number of threads in the threadpool should be a thoughfull choice. A common suggestion is to use as many threads as the ones supported by your cpu.
+
+ Example:
+ thpool_t* myThreadpool; //First we declare a threadpool
+ myThreadpool=thpool_init(4); //then we initialise it to 4 threads
+
+
+-----------------------------------------------------------------------------------
+
+
+
+NAME
+ thpool_add_work(thpool_t* thpool, void *(*function_p)(void*), void* arg_p);
+
+SYNOPSIS
+
+ #include <thpool.h>
+
+ int thpool_add_work(thpool_t* thpool, void *(*function_p)(void*), void* arg_p);
+
+DESCRIPTION
+
+ Adds work to the thread pool. Work is concidered an individual function with an argument. First argument is a pointer to the pool itself. The second argument is a pointer to a function and third argument is a pointer to an argument. To pass multiple arguments just use a struct. If the function you want to pass doesn't fit the parameters of this prototype, use casting. If your function or argument doesn't fit the parameters' and return's value type then you should use casting to avoid warnings from the compiler.
+
+ Example:
+ void printSth(char* str); //Prints a text on the screen
+ thpool_add_work(thpool, (void*)printSth, (void*)str); //Pay attention to the casting
+
+
+-----------------------------------------------------------------------------------
+
+
+NAME
+ void thpool_destroy(thpool_t* tp_p);
+
+SYNOPSIS
+
+ #include <thpool.h>
+
+ void thpool_destroy(thpool_t* tp_p);
+
+DESCRIPTION
+
+ This function will destroy a threadpool. If some threads are working in the pool then thpool_destroy() will wait for them to finish. Once they are finished the threadpool is deallocated releasing all resources back to the system.
+
+ Example:
+ thpool_destroy(threadpool_p); //threadpool_p being a pointer to a thpool_t