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THIS IS THE CODE (i use clion.... and cmake)
#include "tbb/parallel_for.h"
#include "tbb/task_scheduler_init.h"
#include <iostream>
#include <vector>
struct mytask {
mytask(size_t n)
:_n(n)
{}
void operator()() {
for (int i=0;i<1000000;++i) {} // Deliberately run slow
std::cerr << "[" << _n << "]";
}
size_t _n;
};
int main(int,char**) {
//tbb::task_scheduler_init init; // Automatic number of threads
tbb::task_scheduler_init init(tbb::task_scheduler_init::default_num_threads()); // Explicit number of threads
std::vector<mytask> tasks;
for (int i=0;i<1000;++i)
tasks.push_back(mytask(i));
tbb::parallel_for(
tbb::blocked_range<size_t>(0,tasks.size()),
[&tasks](const tbb::blocked_range<size_t>& r) {
for (size_t i=r.begin();i<r.end();++i) tasks();
}
);
std::cerr << std::endl;
return 0;
}
the error is :
CMakeFiles/fibonacci_parallelo.dir/main.cpp.o: nella funzione "main":
/home/luca/CLionProjects/fibonacci_parallelo/main.cpp:20: riferimento non definito a "tbb::task_scheduler_init::default_num_threads()"
CMakeFiles/fibonacci_parallelo.dir/main.cpp.o: nella funzione "tbb::interface9::internal::start_for<tbb::blocked_range<unsigned long>, main::{lambda(tbb::blocked_range<unsigned long> const&)#1}, tbb::auto_partitioner const>::run(tbb::blocked_range<unsigned long> const&, {lambda(tbb::blocked_range<unsigned long> const&)#1} const&, tbb::auto_partitioner&)":
/home/luca/tbb-2017_U7/include/tbb/parallel_for.h:87: riferimento non definito a "tbb::task_group_context::~task_group_context()"
/home/luca/tbb-2017_U7/include/tbb/parallel_for.h:87: riferimento non definito a "tbb::task_group_context::~task_group_context()"
CMakeFiles/fibonacci_parallelo.dir/main.cpp.o:(.rodata+0xf8): riferimento non definito a "typeinfo for tbb::task"
CMakeFiles/fibonacci_parallelo.dir/main.cpp.o: nella funzione "tbb::task_group_context::task_group_context(tbb::task_group_context::kind_type, unsigned long)":
/home/luca/tbb-2017_U7/include/tbb/task.h:463: riferimento non definito a "tbb::task_group_context::init()"
CMakeFiles/fibonacci_parallelo.dir/main.cpp.o: nella funzione "tbb::task::task()":
/home/luca/tbb-2017_U7/include/tbb/task.h:569: riferimento non definito a "vtable for tbb::task"
CMakeFiles/fibonacci_parallelo.dir/main.cpp.o: nella funzione "tbb::task::~task()":
/home/luca/tbb-2017_U7/include/tbb/task.h:573: riferimento non definito a "vtable for tbb::task"
CMakeFiles/fibonacci_parallelo.dir/main.cpp.o: nella funzione "tbb::task::is_cancelled() const":
/home/luca/tbb-2017_U7/include/tbb/task.h:875: riferimento non definito a "tbb::task_group_context::is_group_execution_cancelled() const"
CMakeFiles/fibonacci_parallelo.dir/main.cpp.o: nella funzione "operator new(unsigned long, tbb::internal::allocate_root_with_context_proxy const&)":
/home/luca/tbb-2017_U7/include/tbb/task.h:1018: riferimento non definito a "tbb::internal::allocate_root_with_context_proxy::allocate(unsigned long) const"
*and other more*
for every function in tbb::task there is "a unspecified reference to...."
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Hi,
Do you link Intel TBB library to the application? E.g. "-ltbb" with gcc and some other compilers.
Regards,
Alex
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