From 5d8f37ad78fc66901af50c762029a501561f3b23 Mon Sep 17 00:00:00 2001
From: David 'Digit' Turner <digit@google.com>
Date: Mon, 14 Sep 2009 14:32:27 -0700
Subject: Merge upstream QEMU 10.0.50 into the Android source tree.

This change integrates many changes from the upstream QEMU sources.
Its main purpose is to enable correct ARMv6 and ARMv7 support to the
Android emulator. Due to the nature of the upstream code base, this
unfortunately also required changes to many other parts of the source.

Note that to ensure easier integrations in the future, some source files
and directories that have heavy Android-specific customization have been
renamed with an -android suffix. The original files are still there for
easier integration tracking, but *never* compiled. For example:

  net.c        net-android.c
  qemu-char.c  qemu-char-android.c
  slirp/       slirp-android/
  etc...

Tested on linux-x86, darwin-x86 and windows host machines.
---
 iolooper-select.c | 176 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 176 insertions(+)
 create mode 100644 iolooper-select.c

(limited to 'iolooper-select.c')

diff --git a/iolooper-select.c b/iolooper-select.c
new file mode 100644
index 0000000..74a5a3a
--- /dev/null
+++ b/iolooper-select.c
@@ -0,0 +1,176 @@
+#include "iolooper.h"
+#include "qemu-common.h"
+
+/* An implementation of iolooper.h based on Unix select() */
+#ifdef _WIN32
+#  include <winsock2.h>
+#else
+#  include <sys/types.h>
+#  include <sys/select.h>
+#endif
+
+struct IoLooper {
+    fd_set   reads[1];
+    fd_set   writes[1];
+    fd_set   reads_result[1];
+    fd_set   writes_result[1];
+    int      max_fd;
+    int      max_fd_valid;
+};
+
+IoLooper*
+iolooper_new(void)
+{
+    IoLooper*  iol = qemu_malloc(sizeof(*iol));
+    iolooper_reset(iol);
+    return iol;
+}
+
+void
+iolooper_free( IoLooper*  iol )
+{
+    qemu_free(iol);
+}
+
+void
+iolooper_reset( IoLooper*  iol )
+{
+    FD_ZERO(iol->reads);
+    FD_ZERO(iol->writes);
+    iol->max_fd = -1;
+    iol->max_fd_valid = 1;
+}
+
+static void
+iolooper_add_fd( IoLooper*  iol, int fd )
+{
+    if (iol->max_fd_valid && fd > iol->max_fd) {
+        iol->max_fd = fd;
+    }
+}
+
+static void
+iolooper_del_fd( IoLooper*  iol, int fd )
+{
+    if (iol->max_fd_valid && fd == iol->max_fd)
+        iol->max_fd_valid = 0;
+}
+
+static int
+iolooper_fd_count( IoLooper*  iol )
+{
+    int  max_fd = iol->max_fd;
+    int  fd;
+
+    if (iol->max_fd_valid)
+        return max_fd + 1;
+
+    /* recompute max fd */
+    for (fd = 0; fd < FD_SETSIZE; fd++) {
+        if (!FD_ISSET(fd, iol->reads) && !FD_ISSET(fd, iol->writes))
+            continue;
+
+        max_fd = fd;
+    }
+    iol->max_fd       = max_fd;
+    iol->max_fd_valid = 1;
+
+    return max_fd + 1;
+}
+
+void
+iolooper_add_read( IoLooper*  iol, int  fd )
+{
+    if (fd >= 0) {
+        iolooper_add_fd(iol, fd);
+        FD_SET(fd, iol->reads);
+    }
+}
+
+void
+iolooper_add_write( IoLooper*  iol, int  fd )
+{
+    if (fd >= 0) {
+        iolooper_add_fd(iol, fd);
+        FD_SET(fd, iol->writes);
+    }
+}
+
+void
+iolooper_del_read( IoLooper*  iol, int  fd )
+{
+    if (fd >= 0) {
+        iolooper_del_fd(iol, fd);
+        FD_CLR(fd, iol->reads);
+    }
+}
+
+void
+iolooper_del_write( IoLooper*  iol, int  fd )
+{
+    if (fd >= 0) {
+        iolooper_del_fd(iol, fd);
+        FD_CLR(fd, iol->reads);
+    }
+}
+
+int
+iolooper_poll( IoLooper*  iol )
+{
+    int     count = iolooper_fd_count(iol);
+    int     ret;
+    fd_set  errs;
+
+    if (count == 0)
+        return 0;
+
+    FD_ZERO(&errs);
+
+    do {
+        struct timeval  tv;
+
+        tv.tv_sec = tv.tv_usec = 0;
+
+        iol->reads_result[0]  = iol->reads[0];
+        iol->writes_result[0] = iol->writes[0];
+
+        ret = select( count, iol->reads_result, iol->writes_result, &errs, &tv);
+    } while (ret < 0 && errno == EINTR);
+
+    return ret;
+}
+
+int
+iolooper_wait( IoLooper*  iol, int64_t  duration )
+{
+    int     count = iolooper_fd_count(iol);
+    int     ret;
+    fd_set  errs;
+
+    if (count == 0)
+        return 0;
+
+    FD_ZERO(&errs);
+
+    do {
+        iol->reads_result[0]  = iol->reads[0];
+        iol->writes_result[0] = iol->writes[0];
+
+        ret = select( count, iol->reads_result, iol->writes_result, &errs, NULL);
+    } while (ret < 0 && errno == EINTR);
+
+    return ret;
+}
+
+
+int
+iolooper_is_read( IoLooper*  iol, int  fd )
+{
+    return FD_ISSET(fd, iol->reads_result);
+}
+
+int
+iolooper_is_write( IoLooper*  iol, int  fd )
+{
+    return FD_ISSET(fd, iol->writes_result);
+}
-- 
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