Thomas Munro <thomas.mu...@gmail.com> writes: > It may be madness to try to work around this, but I wonder if we could > use a static local variable that we update with atomic compare > exhange, inside PG_SIGNAL_HANDLER_ENTRY(), and > PG_SIGNAL_HANDLER_EXIT() macros that do nothing on every other system. > On entry, if you can do 0->1 it means you are allowed to run the > function. If it's non-zero, set n->n+1 and return immediately: signal > blocked, but queued for later. On exit, you CAS n->0. If n was > 1, > then you have to jump back to the top and run the function body again.
And ... we're expending all this effort for what exactly? regards, tom lane