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1 | #include <iostream> |
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2 | #include <unistd.h> |
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3 | #include <fcntl.h> |
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4 | #include <stdio.h> |
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5 | |
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6 | int main() |
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7 | { |
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8 | int f; |
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9 | std::string fname = "/tmp/testdb_flat"; |
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10 | f = open(fname.c_str(),O_CREAT|O_RDWR,0600); |
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11 | if (f < 0) |
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12 | { |
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13 | perror("open error:"); |
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14 | return 1; |
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15 | } |
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16 | int rc; |
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17 | struct flock lock; |
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18 | lock.l_type = F_RDLCK|F_WRLCK; |
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19 | lock.l_whence = SEEK_SET; |
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20 | lock.l_start = 0; |
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21 | lock.l_len = 0; |
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22 | |
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23 | std::cout << "getting lock ... \n"; |
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24 | rc = fcntl(f,F_SETLKW,&lock); |
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25 | |
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26 | std::cout << " got it, sleeping\n"; |
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27 | sleep(15); |
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28 | std::cout << " releasing lock\n"; |
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29 | lock.l_type = F_UNLCK; |
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30 | lock.l_whence = SEEK_SET; |
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31 | lock.l_start = 0; |
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32 | lock.l_len = 0; |
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33 | rc = fcntl(f,F_SETLKW,&lock); |
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34 | |
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35 | std::cout << "done\n"; |
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36 | |
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37 | return 0; |
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38 | } |
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