信号完结

C16-并发/parallel/signal/susp_rt.c

@@ -0,0 +1,46 @@
+#include <bits/types/sigset_t.h>
+#include <signal.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+// 编号40
+// kill -40 pid
+#define MYRTSIG (SIGRTMIN + 6)
+
+static void mysig_hander(int s)
+{
+    write(1, "!", 1);
+}
+
+int main(int argc, char** argv)
+{
+    int      i;
+    int      j;
+    sigset_t set;
+    sigset_t oldset;
+    sigset_t saveset;
+
+    //! 要考虑原来是否阻塞的
+    signal(MYRTSIG, mysig_hander);
+    sigemptyset(&set);
+    sigaddset(&set, MYRTSIG);
+    sigprocmask(SIG_UNBLOCK, &set, &saveset);
+    sigprocmask(SIG_BLOCK, &set, &oldset);
+    for (j = 0; j < 1000; j++)
+    {
+        for (i = 0; i < 5; i++)
+        {
+            write(1, "*", 1);
+            sleep(1);
+        }
+        write(1, "\n", 1);
+
+        sigsuspend(&oldset);   // 相当于下面几句的原子操作
+    }
+    // ctrl+\ : quit信号快捷方式
+
+    //!!! 还原原来的阻塞状态
+    sigprocmask(SIG_SETMASK, &saveset, NULL);
+
+    exit(0);
+}