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by jeffreygoesto
1296 days ago
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Close, but not fully. Volatile enforces using an assembly read instruction (does not use a register cached value), but no memory barriers. In ye (really) olden days that seemed enough, but then you know, backwards compatibility... |
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C's "volatile" isn't enough, but more recent C compilers have atomics and memory models.
The memory-model problem wasn't solved until the 00s (that late!!!) when multicore CPUs became more commonplace. Java, C++11, and other language / language updates after that point quickly adopted memory models. And the rest is history.
So yeah, use atomics + memory barriers.