memory_range_lock: Enable interrupt when trylock fails

Also use read-write-lock

Change-Id: I03150b7208325ec1fe422dcd5f931e4e41c8e40e
Refs: #452

test/issues/452/C452T01.c

@@ -0,0 +1,40 @@
+#define _GNU_SOURCE
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <sys/syscall.h>
+#include <sys/mman.h>
+#include <sys/wait.h>
+#include <signal.h>
+#include <errno.h>
+
+int
+main(int argc, char **argv)
+{
+	pid_t pid;
+	int st;
+
+	fprintf(stderr, "*** C452T01 test start\n");
+	fflush(stderr);
+	pid = fork();
+	if (pid == 0) {
+		char file[32];
+
+		sleep(1);
+		sprintf(file, "/proc/%d/maps", getppid());
+		execlp("cat", "cat", file, NULL);
+		exit(1);
+	}
+	fflush(stdout);
+	if (syscall(740, 1) == -1) {
+		fprintf(stderr, "*** C452T01 FAIL no patched kernel\n");
+		exit(1);
+	}
+	mmap(NULL, 4096, PROT_READ|PROT_WRITE,
+	     MAP_ANONYMOUS|MAP_PRIVATE, -1, 0);
+	syscall(740, 0);
+	while (waitpid(pid, &st, 0) == -1 && errno == EINTR)
+		;
+	fprintf(stderr, "*** C452T01 PASS\n");
+	exit(0);
+}