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  • Committer: Thomas Voß
  • Date: 2013-05-28 14:20:45 UTC
  • Revision ID: thomas.voss@canonical.com-20130528142045-kq5umqdmm4o53vwk
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tests/cross_process_sync.h
 
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#ifndef CROSS_PROCESS_SYNC_H_
 
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#define CROSS_PROCESS_SYNC_H_
 
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#include <cstring>
 
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#include <stdexcept>
 
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#include <unistd.h>
 
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namespace test
 
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{
 
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struct CrossProcessSync
 
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{
 
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    static const int read_fd = 0;
 
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    static const int write_fd = 1;
 
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    CrossProcessSync()
 
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    {
 
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        if (pipe(fds) < 0)
 
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            throw std::runtime_error(strerror(errno));
 
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    }
 
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    ~CrossProcessSync() noexcept
 
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    {
 
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        ::close(fds[0]);
 
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        ::close(fds[1]);
 
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    }
 
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    void signal_ready()
 
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    {
 
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        int value = 42;
 
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        if (!write(fds[write_fd], std::addressof(value), sizeof(value)))
 
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            throw std::runtime_error(::strerror(errno));
 
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    }
 
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    void wait_for_signal_ready() const
 
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    {
 
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        int value;
 
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        if (!read(fds[read_fd], std::addressof(value), sizeof(value)))
 
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            throw std::runtime_error(::strerror(errno));
 
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    }
 
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    int fds[2];
 
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};
 
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}
 
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#endif // CROSS_PROCESS_SYNC_H_