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March 11, 2015 05:33
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intrusive ptr
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#include <string> | |
#include <unordered_set> | |
#include <boost/intrusive_ptr.hpp> | |
#include <boost/noncopyable.hpp> | |
#include <gperftools/malloc_extension.h> | |
#include <assert.h> | |
#include <string.h> | |
class Item : boost::noncopyable | |
{ | |
public: | |
Item(const char* key, | |
uint32_t flags, | |
int valuelen, | |
uint64_t cas) | |
: keylen_(strlen(key)), | |
valuelen_(valuelen), | |
cas_(cas) | |
{ | |
char buf[64]; | |
flaglen_ = snprintf(buf, sizeof buf, " %u %d\r\n", flags, valuelen); | |
data_ = static_cast<char*>(::malloc(totalLen())); | |
memcpy(data_, key, keylen_); | |
memcpy(data_ + keylen_, buf, flaglen_); | |
data_[totalLen() - 2] = '\r'; | |
data_[totalLen() - 1] = '\n'; | |
} | |
~Item() | |
{ | |
::free(data_); | |
} | |
void assign(const char* value, int valuelen) | |
{ | |
assert(valuelen <= valuelen_); | |
memcpy(data_ + keylen_ + flaglen_, value, valuelen); | |
} | |
size_t hash() const | |
{ | |
return std::_Hash_impl::hash(data_, keylen_); | |
} | |
bool equals(const Item& rhs) const | |
{ | |
return keylen_ == rhs.keylen_ && memcmp(data_, rhs.data_, keylen_) == 0; | |
} | |
int inc_ref() const | |
{ | |
return ++refcount_; | |
} | |
int dec_ref() const | |
{ | |
return --refcount_; | |
} | |
private: | |
int totalLen() const | |
{ | |
return keylen_ + flaglen_ + valuelen_ + 2; | |
} | |
const uint8_t keylen_; | |
uint8_t flaglen_ = 0; | |
mutable uint16_t refcount_ = 0; | |
const int valuelen_; | |
const uint64_t cas_; | |
char* data_ = nullptr; | |
}; | |
typedef boost::intrusive_ptr<const Item> ConstItemPtr; | |
void intrusive_ptr_add_ref(const Item* p) | |
{ | |
if (p->inc_ref() == 0) | |
assert(false && "refcount overflow"); | |
} | |
void intrusive_ptr_release(const Item* p) | |
{ | |
if (p->dec_ref() == 0) | |
delete p; | |
} | |
struct Hash | |
{ | |
size_t operator()(const ConstItemPtr& x) const | |
{ | |
return x->hash(); | |
} | |
}; | |
struct Equal | |
{ | |
bool operator()(const ConstItemPtr& x, const ConstItemPtr& y) const | |
{ | |
return x->equals(*y); | |
} | |
}; | |
typedef std::unordered_set<ConstItemPtr, Hash, Equal> Map; | |
int main(int argc, char* argv[]) | |
{ | |
MallocExtension::Initialize(); | |
int items = argc > 1 ? atoi(argv[1]) : 1000 * 1000; | |
int keylen = 10; | |
int valuelen = 100; | |
char key[256] = { 0 }; | |
std::string value; | |
Map theMap; | |
for (int i = 0; i < items; ++i) | |
{ | |
snprintf(key, sizeof key, "%0*d", keylen, i); | |
value.assign(valuelen, "0123456789"[i % 10]); | |
boost::intrusive_ptr<Item> item(new Item(key, 0, valuelen, 1)); | |
item->assign(value.data(), value.size()); | |
auto result = theMap.insert(std::move(item)); | |
assert(result.second); | |
} | |
printf("sizeof Item = %zd\n", sizeof(Item)); | |
printf("sizeof intrusive_ptr = %zd\n", sizeof(boost::intrusive_ptr<Item>)); | |
printf("items = %zd\n", theMap.size()); | |
char buf[65536] = ""; | |
MallocExtension::instance()->GetStats(buf, sizeof buf); | |
printf("%s\n", buf); | |
} |
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#include <string> | |
#include <unordered_set> | |
#include <boost/intrusive_ptr.hpp> | |
#include <boost/noncopyable.hpp> | |
#include <gperftools/malloc_extension.h> | |
#include <assert.h> | |
#include <string.h> | |
class Item : boost::noncopyable | |
{ | |
public: | |
Item(const char* key, | |
uint32_t flags, | |
int valuelen, | |
uint64_t cas) | |
: keylen_(strlen(key)), | |
valuelen_(valuelen), | |
hash_(std::_Hash_impl::hash(key, keylen_)), | |
cas_(cas) | |
{ | |
char buf[64]; | |
flaglen_ = snprintf(buf, sizeof buf, " %u %d\r\n", flags, valuelen); | |
data_ = static_cast<char*>(::malloc(totalLen())); | |
memcpy(data_, key, keylen_); | |
memcpy(data_ + keylen_, buf, flaglen_); | |
data_[totalLen() - 2] = '\r'; | |
data_[totalLen() - 1] = '\n'; | |
} | |
~Item() | |
{ | |
::free(data_); | |
} | |
void assign(const char* value, int valuelen) | |
{ | |
assert(valuelen <= valuelen_); | |
memcpy(data_ + keylen_ + flaglen_, value, valuelen); | |
} | |
size_t hash() const | |
{ | |
return hash_; | |
} | |
bool equals(const Item& rhs) const | |
{ | |
return keylen_ == rhs.keylen_ && memcmp(data_, rhs.data_, keylen_) == 0; | |
} | |
int inc_ref() const | |
{ | |
return ++refcount_; | |
} | |
int dec_ref() const | |
{ | |
return --refcount_; | |
} | |
private: | |
int totalLen() const | |
{ | |
return keylen_ + flaglen_ + valuelen_ + 2; | |
} | |
const uint8_t keylen_; | |
uint8_t flaglen_ = 0; | |
mutable uint16_t refcount_ = 0; | |
const int valuelen_; | |
const size_t hash_; | |
const uint64_t cas_; | |
char* data_ = nullptr; | |
}; | |
typedef boost::intrusive_ptr<const Item> ConstItemPtr; | |
void intrusive_ptr_add_ref(const Item* p) | |
{ | |
if (p->inc_ref() == 0) | |
assert(false && "refcount overflow"); | |
} | |
void intrusive_ptr_release(const Item* p) | |
{ | |
if (p->dec_ref() == 0) | |
delete p; | |
} | |
struct Hash | |
{ | |
size_t operator()(const ConstItemPtr& x) const noexcept // noexcept is the key | |
{ | |
return x->hash(); | |
} | |
}; | |
struct Equal | |
{ | |
bool operator()(const ConstItemPtr& x, const ConstItemPtr& y) const | |
{ | |
return x->equals(*y); | |
} | |
}; | |
typedef std::unordered_set<ConstItemPtr, Hash, Equal> Map; | |
int main(int argc, char* argv[]) | |
{ | |
MallocExtension::Initialize(); | |
int items = argc > 1 ? atoi(argv[1]) : 1000 * 1000; | |
int keylen = 10; | |
int valuelen = 100; | |
char key[256] = { 0 }; | |
std::string value; | |
Map theMap; | |
for (int i = 0; i < items; ++i) | |
{ | |
snprintf(key, sizeof key, "%0*d", keylen, i); | |
value.assign(valuelen, "0123456789"[i % 10]); | |
boost::intrusive_ptr<Item> item(new Item(key, 0, valuelen, 1)); | |
item->assign(value.data(), value.size()); | |
auto result = theMap.insert(std::move(item)); | |
assert(result.second); | |
} | |
printf("sizeof Item = %zd\n", sizeof(Item)); | |
printf("sizeof intrusive_ptr = %zd\n", sizeof(boost::intrusive_ptr<Item>)); | |
printf("items = %zd\n", theMap.size()); | |
char buf[65536] = ""; | |
MallocExtension::instance()->GetStats(buf, sizeof buf); | |
printf("%s\n", buf); | |
} |
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