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shm: handle shrink failure gracefully

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This commit is contained in:
Alexey Rybalchenko
2021-03-23 03:47:48 +01:00
parent 72f319e276
commit 9a9c49a089
2 changed files with 40 additions and 20 deletions
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30
fairmq/shmem/Message.h
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@@ -211,11 +211,31 @@ class Message final : public fair::mq::Message
return true;
} else if (newSize <= fMeta.fSize) {
try {
fLocalPtr = fManager.ShrinkInPlace(newSize, fLocalPtr, fMeta.fSegmentId);
fMeta.fSize = newSize;
return true;
try {
fLocalPtr = fManager.ShrinkInPlace(newSize, fLocalPtr, fMeta.fSegmentId);
fMeta.fSize = newSize;
return true;
} catch (boost::interprocess::bad_alloc& e) {
// if shrinking fails (can happen due to boost alignment requirements):
// unused size >= 1000000 bytes: reallocate fully
// unused size < 1000000 bytes: simply reset the size and keep the rest of the buffer until message destruction
if (fMeta.fSize - newSize >= 1000000) {
char* newPtr = fManager.Allocate(newSize, fAlignment);
if (newPtr) {
std::memcpy(newPtr, fLocalPtr, newSize);
fManager.Deallocate(fMeta.fHandle, fMeta.fSegmentId);
fLocalPtr = newPtr;
fMeta.fHandle = fManager.GetHandleFromAddress(fLocalPtr, fMeta.fSegmentId);
} else {
LOG(debug) << "could not set used size: " << e.what();
return false;
}
}
fMeta.fSize = newSize;
return true;
}
} catch (boost::interprocess::interprocess_exception& e) {
LOG(info) << "could not set used size: " << e.what();
LOG(debug) << "could not set used size: " << e.what();
return false;
}
} else {
@@ -257,7 +277,7 @@ class Message final : public fair::mq::Message
Manager& fManager;
bool fQueued;
MetaHeader fMeta;
size_t fAlignment; // TODO: put this to debug mode
size_t fAlignment;
mutable Region* fRegionPtr;
mutable char* fLocalPtr;