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Computers and Technology, 03.06.2021 05:00, makaylahunt
You are given a new atomic primitive, called FetchAndSubtract(). It executes as a single atomic instruction, and is defined as follows:
int FetchAndSubtract(int *location) {
int value = *location; // read the value pointed to by location
*location = value - 1; // decrement it, and store result back
return value; // return old value
}
Write the lock_init(), lock(), and unlock() routines that use FetchAndSubtract() to implement a working lock. Also define a lock_t structure.
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You are given a new atomic primitive, called FetchAndSubtract(). It executes as a single atomic inst...
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