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Use shared_ptr to keep track of DeviceScan across multiple collections

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Fixes #681.

Relying on memory allocated by `std::vector` via direct pointers is dangerous,
as vectors may move buffers during resize. This fix puts the `DeviceScan`
allocation into a `str::shared_ptr`, which 1) allocates the memory on heap and
2) keeps track of the memory through reference counting. Thus it is safe to
store the `shared_ptr` across different vectors/maps.
This commit is contained in:
Andreas Baulig 2021-05-30 08:23:40 +00:00
parent 1e5c4343d1
commit 94ab1bb438
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GPG Key ID: 5225DCE5A4A2EE20
2 changed files with 24 additions and 13 deletions
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30
devices/plutosdr/deviceplutosdrscan.cpp
View File

@ -19,6 +19,7 @@
#include <cstdio> #include <cstdio>
#include <cstring> #include <cstring>
#include <regex> #include <regex>
#include <memory>
#include <iio.h> #include <iio.h>
#include <QtGlobal> #include <QtGlobal>
@ -49,6 +50,7 @@ void DevicePlutoSDRScan::scan()
} }
m_scans.clear(); m_scans.clear();
m_scans.reserve(num_contexts);
for (i = 0; i < num_contexts; i++) for (i = 0; i < num_contexts; i++)
{ {
@ -64,17 +66,25 @@ void DevicePlutoSDRScan::scan()
if (pch) if (pch)
{ {
m_scans.push_back({std::string(description), std::string("TBD"), std::string(uri)}); // As device scan is used across multiple vectors it's best to use a
m_urilMap[m_scans.back().m_uri] = &m_scans.back(); // managed pointer, as to keep track of when it's safe to delete.
std::shared_ptr<DeviceScan> dev_scan = std::make_shared<DeviceScan>(
DeviceScan({
std::string(description),
std::string("TBD"),
std::string(uri)
}));
m_scans.push_back(dev_scan);
m_urilMap[m_scans.back()->m_uri] = m_scans.back();
std::regex desc_regex(".*serial=(.+)"); std::regex desc_regex(".*serial=(.+)");
std::smatch desc_match; std::smatch desc_match;
std::regex_search(m_scans.back().m_name, desc_match, desc_regex); std::regex_search(m_scans.back()->m_name, desc_match, desc_regex);
if (desc_match.size() == 2) if (desc_match.size() == 2)
{ {
m_scans.back().m_serial = desc_match[1]; m_scans.back()->m_serial = desc_match[1];
m_serialMap[m_scans.back().m_serial] = &m_scans.back(); m_serialMap[m_scans.back()->m_serial] = m_scans.back();
} }
} }
} }
@ -86,7 +96,7 @@ void DevicePlutoSDRScan::scan()
const std::string* DevicePlutoSDRScan::getURIAt(unsigned int index) const const std::string* DevicePlutoSDRScan::getURIAt(unsigned int index) const
{ {
if (index < m_scans.size()) { if (index < m_scans.size()) {
return &(m_scans[index].m_uri); return &(m_scans[index]->m_uri);
} else { } else {
return 0; return 0;
} }
@ -95,7 +105,7 @@ const std::string* DevicePlutoSDRScan::getURIAt(unsigned int index) const
const std::string* DevicePlutoSDRScan::getSerialAt(unsigned int index) const const std::string* DevicePlutoSDRScan::getSerialAt(unsigned int index) const
{ {
if (index < m_scans.size()) { if (index < m_scans.size()) {
return &(m_scans[index].m_serial); return &(m_scans[index]->m_serial);
} else { } else {
return 0; return 0;
} }
@ -104,7 +114,7 @@ const std::string* DevicePlutoSDRScan::getSerialAt(unsigned int index) const
const std::string* DevicePlutoSDRScan::getURIFromSerial( const std::string* DevicePlutoSDRScan::getURIFromSerial(
const std::string& serial) const const std::string& serial) const
{ {
std::map<std::string, DeviceScan*>::const_iterator it = m_serialMap.find(serial); std::map<std::string, std::shared_ptr<DeviceScan>>::const_iterator it = m_serialMap.find(serial);
if (it == m_serialMap.end()) { if (it == m_serialMap.end()) {
return 0; return 0;
} else { } else {
@ -114,11 +124,11 @@ const std::string* DevicePlutoSDRScan::getURIFromSerial(
void DevicePlutoSDRScan::getSerials(std::vector<std::string>& serials) const void DevicePlutoSDRScan::getSerials(std::vector<std::string>& serials) const
{ {
std::vector<DeviceScan>::const_iterator it = m_scans.begin(); std::vector<std::shared_ptr<DeviceScan>>::const_iterator it = m_scans.begin();
serials.clear(); serials.clear();
for (; it != m_scans.end(); ++it) { for (; it != m_scans.end(); ++it) {
serials.push_back(it->m_serial); serials.push_back((*it)->m_serial);
} }
} }

7
devices/plutosdr/deviceplutosdrscan.h
View File

@ -23,6 +23,7 @@
#include <string> #include <string>
#include <vector> #include <vector>
#include <map> #include <map>
#include <memory>
#include "plugin/plugininterface.h" #include "plugin/plugininterface.h"
#include "export.h" #include "export.h"
@ -46,9 +47,9 @@ public:
void enumOriginDevices(const QString& hardwareId, PluginInterface::OriginDevices& originDevices); void enumOriginDevices(const QString& hardwareId, PluginInterface::OriginDevices& originDevices);
private: private:
std::vector<DeviceScan> m_scans; std::vector<std::shared_ptr<DeviceScan>> m_scans;
std::map<std::string, DeviceScan*> m_serialMap; std::map<std::string, std::shared_ptr<DeviceScan>> m_serialMap;
std::map<std::string, DeviceScan*> m_urilMap; std::map<std::string, std::shared_ptr<DeviceScan>> m_urilMap;
}; };