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Solution to Critical Section Problem
- Consider two processes P0 and P1.
- Shared variables (for solution to CSP)
- int turn; boolean flag[2];
- flag[i] is true when Piis ready to enter its critical section.
while (1) {
flag[i] = TRUE; turn = j;
while (flag[j] && turn == j);
Critical section
flag[i] = FALSE;
Remainder section
} |
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Synchronization Support in OS/ISA
- Synchronization code can be written using locks
while (1) {
Non critical code
Acquire Lock
Critical Section Code
Release Lock
}
- Implementation of Lock require support from the ISA
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