/******************************************************** * An example source module to accompany... * * "Using POSIX Threads: Programming with Pthreads" *     by Brad nichols, Dick Buttlar, Jackie Farrell *     O'Reilly & Associates, Inc. * ******************************************************** * struct.c * * Showing what various locking scheme choices look * like in the data structures */#include <pthread.h>#define DATA_SIZE 100pthread_mutex_t data1_lock= PTHREAD_MUTEX_INITIALIZER;   struct data1_record {	int	code;	int	field1;	int	field2;	int	field3;} data1[DATA_SIZE];struct data2_record {	int     code;        int     field1;        int     field2;        int     field3;	pthread_mutex_t data1_lock;} data2[DATA_SIZE];main(){	 }