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#include <node.h>
#include <v8.h>
#include <stdlib.h>
#ifdef _AIX
// AIX allows over-allocation, and will SIGKILL when the allocated pages are
// used if there is not enough VM. Check for available space until
// out-of-memory. Don't allow more then some (large) proportion of it to be
// used for the test strings, so Node & V8 have some space for allocations.
#include <signal.h>
#include <sys/vminfo.h>
static void* Allowed(size_t size) {
blkcnt_t allowedBlocks = psdanger(SIGKILL);
if (allowedBlocks < 1) {
// Already OOM
return nullptr;
}
const size_t BYTES_PER_BLOCK = 512;
size_t allowed = (allowedBlocks * BYTES_PER_BLOCK * 4) / 5;
if (size < allowed) {
return malloc(size);
}
return nullptr;
}
#else
// Other systems also allow over-allocation, but this malloc-and-free approach
// seems to be working for them.
static void* Allowed(size_t size) {
return malloc(size);
}
#endif // _AIX
void EnsureAllocation(const v8::FunctionCallbackInfo<v8::Value> &args) {
v8::Isolate* isolate = args.GetIsolate();
uintptr_t size = args[0].As<v8::Integer>()->Value();
v8::Local<v8::Boolean> success;
void* buffer = Allowed(size);
if (buffer) {
success = v8::Boolean::New(isolate, true);
free(buffer);
} else {
success = v8::Boolean::New(isolate, false);
}
args.GetReturnValue().Set(success);
}
void init(v8::Local<v8::Object> exports) {
NODE_SET_METHOD(exports, "ensureAllocation", EnsureAllocation);
}
NODE_MODULE(NODE_GYP_MODULE_NAME, init)
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