# Study of POSIX Threads - Part 1

* [Aim](#Aim)
* [Theory](#Theory)
* [Program](#Program)
* [Execution Steps](#Execution)
* [Output](#Output)
* [Result](#Result)

## Aim
Study the basic posix thread functions – pthread_create, pthread_join, pthread_self, pthread_detach, pthread_exit

## Theory
### 1.pthread_create()
Header File: pthread.h\
Syntax: `int pthread_create(pthread_t *restrict thread,
const pthread_attr_t *restrict attr,
void *(*start_routine)(void *),
void *restrict arg);`
Description: The pthread_create() function starts a new thread in the calling process.The new thread starts execution by invoking start_routine(); arg is passed as the sole argument of start_routine()
### 2.pthread_join()
Header File: pthread.h\
Syntax: ` int pthread_join(pthread_t thread, void **retval);`\
Description: The pthread_join() function waits for the thread specified by thread to terminate. If that thread has already terminated, then pthread_join() returns immediately.The thread specified by thread must be joinable.

### 3.pthread_self()
Header File: pthread.h\

Syntax: ` pthread_t pthread_self(void);`\
Description: The pthread_self() function returns the ID of the calling thread.This is the same value that is returned in thread in the pthread_create() call that created this thread.
### 4.pthread_detach()
Header File: pthread.h\
Syntax: ` int pthread_detach(pthread_t thread);`\
Description: The pthread_detach() function shall indicate to the implementation that storage for the thread thread can be reclaimed when that thread terminates. If thread has not terminated, pthread_detach() shall not cause it to terminate.
### 5.pthread_exit()
Header File: pthread.h\
Syntax: ` noreturn void pthread_exit(void *retval);`\
Description: The pthread_exit() function terminates the calling thread and returns a value via retval that (if the thread is joinable) is available to another thread in the same process that calls pthread_join(3)

## Program
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## Execution
1. Start
2. pthread calls:- pthread_create,pthread_join,pthread_self,pthread_detach,pthread_exit are made during the execution of the program
3. Run the program
4. Terminate

## Output

## Result
The program has been executed successfully.The pthread calls have been made successfully through the runtime of the program.