priority_pos.hpp

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/*****************************************************************************
** Ifdefs
*****************************************************************************/

#ifndef ECL_THREADS_PRIORITY_POS_HPP_
#define ECL_THREADS_PRIORITY_POS_HPP_

/*****************************************************************************
** Platform Check
*****************************************************************************/

#include <ecl/config/ecl.hpp>
#if defined(ECL_IS_POSIX)

/*****************************************************************************
** Includes
*****************************************************************************/

#include <unistd.h>
#include <string>
#include <sstream>
#include <errno.h>
#include <sys/resource.h>
#include <ecl/config/ecl.hpp>
#include <ecl/exceptions/macros.hpp>
#include <ecl/exceptions/standard_exception.hpp>
#include "priority_common.hpp"

/*****************************************************************************
** Namespaces
*****************************************************************************/

namespace ecl {

bool ECL_PUBLIC set_priority(Priority priority_level) ecl_debug_throw_decl(StandardException);
Priority ECL_PUBLIC get_priority() ecl_debug_throw_decl(StandardException);

std::string ECL_PUBLIC print_priority_diagnostics() ecl_debug_throw_decl(StandardException);

/*****************************************************************************
** Namespace
*****************************************************************************/

namespace threads {

bool ECL_LOCAL set_real_time_priority(int policy,int priority_level) ecl_debug_throw_decl(StandardException);

} // namespace threads
} // namespace ecl

/*****************************************************************************
** Interface [Exceptions]
*****************************************************************************/

#if defined(ECL_HAS_EXCEPTIONS)
namespace ecl {
namespace threads {

/*****************************************************************************
** Interface [Priority Exceptions]
*****************************************************************************/
inline StandardException ECL_LOCAL throwPriorityException(const char* loc ) {
        int error_result = errno;
    switch (error_result) {
        case ( EINVAL ) : return StandardException(loc, ecl::InvalidInputError, "The specified param structure or priority group was invalid.");
        case ( ESRCH  ) : return StandardException(loc, ecl::InvalidInputError, "The process specified could not be found.");
        case ( EPERM  ) : return StandardException(loc, ecl::PermissionsError, "The caller does not have the appropriate privileges for realtime scheduling (http://snorriheim.dnsdojo.com/doku/doku.php/en:linux:admin:priorities).");
        case ( EACCES ) : return StandardException(loc, ecl::PermissionsError, "The caller does not have the appropriate privileges for elevating the process priority by reducing the niceness value (http://snorriheim.dnsdojo.com/doku/doku.php/en:linux:admin:priorities).");
                default         :
                {
                        std::ostringstream ostream;
                        ostream << "Unknown posix error " << error_result << ": " << strerror(error_result) << ".";
                        return StandardException(loc, UnknownError, ostream.str());
                }
    }
}


}; // namespace threads
} // namespace ecl
#endif /* ECL_HAS_EXCEPTIONS */
#endif /* ECL_IS_POSIX */
#endif /* ECL_THREADS_PRIORITY_POS_HPP_ */


//        void yield();
//        void capabilities() throw(StandardException);


// * Yields this process (must be a real-time process) to lower priority processes.
// * In effect, this places the process at the back of the cpu queue, even if there
// * are lower priority processes ahead of it.
// */
//inline void Process::yield()
//{
//    sched_yield();
//}

// * Print out the posix capabilities of your program.
// */
//inline void Process::capabilities() throw(StandardException)
//{
//    cap_t cap = cap_get_proc();
//
//    if (!cap) {
//        throw StandardException(LOC,"Could not retrieve posix characteristics.","Was not possible to retrieve the processes' posix capability list.");
//    }
//    std::cout << "Posix capabilities " << cap_to_text(cap,NULL) << std::endl;
//    cap_free(cap);
//}