<span style="color: #0000ff">void locksem(<span style="color: #0000ff">int semid,<span style="color: #0000ff">int<span style="color: #000000"> semnum)
{
<span style="color: #0000ff">struct<span style="color: #000000"> sembuf sb;
sb.sem_num =<span style="color: #000000"> semnum;
sb.sem_op = -<span style="color: #800080">1<span style="color: #000000">;
sb.sem_flg =<span style="color: #000000"> SEM_UNDO;
safesemop(semid,&sb,<span style="color: #800080">1<span style="color: #000000">);
}

<span style="color: #0000ff">void unlocksem(<span style="color: #0000ff">int semid,<span style="color: #0000ff">int<span style="color: #000000"> semnum)
{
<span style="color: #0000ff">struct<span style="color: #000000"> sembuf sb;
sb.sem_num =<span style="color: #000000"> semnum;
sb.sem_op = <span style="color: #800080">1<span style="color: #000000">;
sb.sem_flg =<span style="color: #000000"> SEM_UNDO;
safesemop(semid,<span style="color: #800080">1<span style="color: #000000">);
}
…

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