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Make the Loader API thread-safe

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Since the majority of the code is using ReadAt API already, map this to
a `readp` "syscall" which does not mutate any state about the file
descriptor therefore making it fairly safe multi-threading wise.

This allows to get rid of read-time mutexes in RamCachedFileLoader and
therefore fixes #9803
This commit is contained in:
Simonas Kazlauskas 2017-06-23 17:23:43 +03:00
parent 3249d81654
commit 3c3596dbf2
14 changed files with 7 additions and 107 deletions
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7
Core/FileLoaders/RetryingFileLoader.cpp
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@ -19,7 +19,7 @@
// Takes ownership of backend.
RetryingFileLoader::RetryingFileLoader(FileLoader *backend)
: filepos_(0), backend_(backend) {
: backend_(backend) {
}
RetryingFileLoader::~RetryingFileLoader() {
@ -60,10 +60,6 @@ std::string RetryingFileLoader::Path() const {
return backend_->Path();
}
void RetryingFileLoader::Seek(s64 absolutePos) {
filepos_ = absolutePos;
}
size_t RetryingFileLoader::ReadAt(s64 absolutePos, size_t bytes, void *data, Flags flags) {
size_t readSize = backend_->ReadAt(absolutePos, bytes, data, flags);
@ -74,6 +70,5 @@ size_t RetryingFileLoader::ReadAt(s64 absolutePos, size_t bytes, void *data, Fla
++retries;
}
filepos_ = absolutePos + readSize;
return readSize;
}