#include <pthread.h>

pthread_join is waiting for a thread to teminate, collecting return value as a string inside retval pointer, on success - NULL is returned.

int pthread_join(pthread_t thread, void **retval)

pthread_create starts a new thread, thread returns thread ID, attr can be NULL for default, void * (*start_routine) pointer to function which takes void *, arg is argument for the function

int pthread_create(pthread_t *restrict thread, const pthread_attr_t *restrict attr, void *(*start_routine)(void *), void *restrict arg);

pthread_detach marks the thread as detached, which means its resources are released to the system, with no need to pthread_join, returns 0 or errno

int pthread_detach(pthread_t thread);

pthread_mutex_init - attr = NULL for default, makes mutex initialized and unlocked

int pthread_mutex_init(pthread_mutex_t *restrict mutex, const pthread_mutexattr_t *restrict attr);

pthread_mutex_destroy - it's only safe to destroy (make uninitialized) an initialized mutex that is unlocked

int pthread_mutex_destroy(pthread_mutex_t *mutex);

pthread_mutex_lock

int pthread_mutex_lock(pthread_mutex_t *mutex); pthread_mutex_unlock int pthread_mutex_unlock(pthread_mutex_t *mutex);

gettimeofday

int gettimeofday(struct timeval *restrict tv, struct timezone *_Nullable restrict tz);

struct timeval { time_t tv_sec; /* seconds / suseconds_t tv_usec; / microseconds */ };

struct timezone { int tz_minuteswest; /* minutes west of Greenwich / int tz_dsttime; / type of DST correction */ };

usleep - stop thread execution of the thread for min usec microseconds, 0 on success, -1 on err.

int usleep(useconds_t usec);

• POSIX thread (pthread) libraries
• Dining Philosophers Problem (Wiki)
• Multithreading in C (GeeksforGeeks)

• learn how new functions for threads and thread lock work
• learn about Dining Philosophers problem
• write a draft for my Philo solution
• check the coded C solutions available
• modify the draft of my solution