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88 lines
2.2 KiB
C++
88 lines
2.2 KiB
C++
9 years ago
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// ***************************************************************** -*- C++ -*-
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// mt-test.cpp $Rev: 3090 $
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// Sample multi-threading program
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// requires C++11
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// On Mac #define __cplusplus 201103L
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// Older compilers #define __cplusplus 199711
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// Compiler switches: -std=c++11 -stdlib=libc++ (set in samples/Makefile)
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// Discussion: http://dev.exiv2.org/issues/1207
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// Caution: This code isn't currently exercised any bash script in the test suite
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#include <exiv2/exiv2.hpp>
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#include <iostream>
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#include <iomanip>
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#include <cassert>
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#include <string>
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#include <thread>
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#include <mutex>
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// mutex to for exclusive reporting
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std::mutex m;
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void reportExifMetadataCount(int n,const char* argv[])
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{
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int count = 0 ;
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std::string what;
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// count the exif metadata in the file
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try {
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Exiv2::Image::AutoPtr image = Exiv2::ImageFactory::open(argv[n]);
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assert(image.get() != 0);
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image->readMetadata();
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Exiv2::ExifData &exifData = image->exifData();
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if (!exifData.empty()) {
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Exiv2::ExifData::const_iterator end = exifData.end();
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for (Exiv2::ExifData::const_iterator i = exifData.begin(); i != end; ++i)
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count++;
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}
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} catch (Exiv2::Error& e) {
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what = e.what() ;
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count = -1;
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}
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// report to the user
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m.lock();
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std::cout << "file: " << argv[n] << " "
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<< "n: " << n << " "
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<< "count: " << count << " "
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<< (count < 0 ? "exception: " : what)
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<< what << std::endl;
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m.unlock();
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}
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int main(int argc,const char* argv[])
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{
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int result = 0;
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if ( argc < 2 ) {
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std::cerr << "syntax: " << argv[0] << " [path]+" << std::endl;
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result = 1 ;
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} else {
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// Initialize XmpParser before starting threads
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Exiv2::XmpParser::initialize();
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// bucket of threads
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const int TMAX=1000;
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std::thread threads[TMAX];
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int argm = argc > TMAX ? TMAX : argc;
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// spin up the treads
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for ( int arg = 1 ; arg < argm ; arg++ ) {
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threads[arg] = std::thread(reportExifMetadataCount,arg,argv);
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}
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// wait for them to finish
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for ( int arg = 1 ; arg < argm ; arg++ ) {
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if ( threads[arg].joinable() )
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threads[arg].join();
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}
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}
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return result;
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}
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// That's all Folks!
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////
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