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cpthreadsmutex
JoSav
JoSav

Reputation: 247

Mutex lock a variable

I'm searching a way to lock a variable in a C program. The fact is this variable is set in loop by a thread but in the other hand I have in my main an infinite loop who's reading this variable.

Is there anyway to perform this?

Upvotes: 1

Views: 4600

Answers (1)

jim mcnamara
jim mcnamara

Reputation: 16379

Consider a mutex:

volatile int var=0;
pthread_mutex_t mtx=PTHREAD_MUTEX_INITIALIZER;

to read the variable:

pthread_mutex_lock(&mtx);
local_var=var;
pthread_mutex_unlock(&mtx);

to set the variable:

pthread_mutex_lock(&mtx);
var=19;
pthread_mutex_unlock(&mtx);

This would be what is needed if you are writing a threaded application - you have a pthreads tag.

Upvotes: 2

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