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push shouldn't return false after force_push has been called

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This commit is contained in:
zhangyi 2020-03-28 22:19:37 +08:00
parent 9b2bd3787a
commit 6850b47e3a
2 changed files with 13 additions and 10 deletions
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8
src/circ/elem_def.h
View File

@ -45,11 +45,11 @@ public:
cc_t connect() noexcept {
for (unsigned k = 0;;) {
cc_t cur = cc_.load(std::memory_order_acquire);
cc_t next = cur | (cur + 1); // find the first 0, and set it to 1.
cc_t curr = cc_.load(std::memory_order_acquire);
cc_t next = curr | (curr + 1); // find the first 0, and set it to 1.
if (next == 0) return 0;
if (cc_.compare_exchange_weak(cur, next, std::memory_order_release)) {
return next ^ cur; // return connected id
if (cc_.compare_exchange_weak(curr, next, std::memory_order_release)) {
return next ^ curr; // return connected id
}
ipc::yield(k);
}

9
src/prod_cons.h
View File

@ -222,7 +222,7 @@ struct prod_cons_impl<wr<relat::single, relat::multi, trans::broadcast>> {
// check all consumers have finished reading this element
auto cur_rc = el->rc_.load(std::memory_order_acquire);
if (cc & cur_rc) {
ipc::log("force_push: k = %d, cc = %d, rem_cc = %d\n", k, cc, cur_rc);
ipc::log("force_push: k = %u, cc = %u, rem_cc = %u\n", k, cc, cur_rc);
cc = wrapper->elems()->disconnect(cur_rc); // disconnect all remained readers
if (cc == 0) return false; // no reader
}
@ -292,13 +292,16 @@ struct prod_cons_impl<wr<relat::multi , relat::multi, trans::broadcast>> {
el = elems + circ::index_of(cur_ct = ct_.load(std::memory_order_relaxed));
// check all consumers have finished reading this element
auto cur_rc = el->rc_.load(std::memory_order_acquire);
if (cc & (cur_rc & rc_mask)) {
circ::cc_t rem_cc = cur_rc & rc_mask;
if (cc & rem_cc) {
return false; // has not finished yet
}
else if (!rem_cc) {
auto cur_fl = el->f_ct_.load(std::memory_order_acquire);
if ((cur_fl != cur_ct) && cur_fl) {
return false; // full
}
}
// (cur_rc & rc_mask) should be 0 here
if (el->rc_.compare_exchange_weak(
cur_rc, ((cur_rc + rc_incr) & ~rc_mask) | static_cast<rc_t>(cc), std::memory_order_release)) {
@ -326,7 +329,7 @@ struct prod_cons_impl<wr<relat::multi , relat::multi, trans::broadcast>> {
auto cur_rc = el->rc_.load(std::memory_order_acquire);
circ::cc_t rem_cc = cur_rc & rc_mask;
if (cc & rem_cc) {
ipc::log("force_push: k = %d, cc = %d, rem_cc = %d\n", k, cc, rem_cc);
ipc::log("force_push: k = %u, cc = %u, rem_cc = %u\n", k, cc, rem_cc);
cc = wrapper->elems()->disconnect(rem_cc); // disconnect all remained readers
if (cc == 0) return false; // no reader
}