On 9/12/19 4:04 PM, William Tambe wrote: > Is there an example, not necessarily for atomic_exchange, that I can follow ? > > Also, is this behavior related to GCC memory model ? ie: > (MEM_VOLATILE_P (operands[1])) for atomic_exchange always TRUE > regardless of whether the memory operand was declared using > "volatile" I've been thinking about this, and have been unable to come up with a use for a non-volatile atomic_exchange. If you had such a thing you'd also have undefined behaviour if an other thread accessed the operand racily. -- Andrew Haley (he/him) Java Platform Lead Engineer Red Hat UK Ltd. <https://www.redhat.com> https://keybase.io/andrewhaley EAC8 43EB D3EF DB98 CC77 2FAD A5CD 6035 332F A671
