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[x64] Fix improper use of compare_exchange_strong when adjusting code commit mark

This commit is contained in:
Dr. Chat 2018-11-18 18:24:35 -06:00
parent bcfaf530cb
commit a8bef91cc4
1 changed files with 16 additions and 12 deletions
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28
src/xenia/cpu/backend/x64/x64_code_cache.cc
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@ -174,15 +174,17 @@ void* X64CodeCache::PlaceGuestCode(uint32_t guest_address, void* machine_code,
// If we are going above the high water mark of committed memory, commit
// some more. It's ok if multiple threads do this, as redundant commits
// aren't harmful.
size_t old_commit_mark = generated_code_commit_mark_;
if (high_mark > old_commit_mark) {
size_t new_commit_mark = old_commit_mark + 16 * 1024 * 1024;
size_t old_commit_mark, new_commit_mark;
do {
old_commit_mark = generated_code_commit_mark_;
if (high_mark <= old_commit_mark) break;
new_commit_mark = old_commit_mark + 16 * 1024 * 1024;
xe::memory::AllocFixed(generated_code_base_, new_commit_mark,
xe::memory::AllocationType::kCommit,
xe::memory::PageAccess::kExecuteReadWrite);
generated_code_commit_mark_.compare_exchange_strong(old_commit_mark,
new_commit_mark);
}
} while (generated_code_commit_mark_.compare_exchange_weak(
old_commit_mark, new_commit_mark));
// Copy code.
std::memcpy(code_address, machine_code, code_size);
@ -248,15 +250,17 @@ uint32_t X64CodeCache::PlaceData(const void* data, size_t length) {
// If we are going above the high water mark of committed memory, commit some
// more. It's ok if multiple threads do this, as redundant commits aren't
// harmful.
size_t old_commit_mark = generated_code_commit_mark_;
if (high_mark > old_commit_mark) {
size_t new_commit_mark = old_commit_mark + 16 * 1024 * 1024;
size_t old_commit_mark, new_commit_mark;
do {
old_commit_mark = generated_code_commit_mark_;
if (high_mark <= old_commit_mark) break;
new_commit_mark = old_commit_mark + 16 * 1024 * 1024;
xe::memory::AllocFixed(generated_code_base_, new_commit_mark,
xe::memory::AllocationType::kCommit,
xe::memory::PageAccess::kExecuteReadWrite);
generated_code_commit_mark_.compare_exchange_strong(old_commit_mark,
new_commit_mark);
}
} while (generated_code_commit_mark_.compare_exchange_weak(old_commit_mark,
new_commit_mark));
// Copy code.
std::memcpy(data_address, data, length);