[Xen-changelog] [xen-unstable] libxc: free thread specific hypercall buffer on xc_interface_close

[Xen patchbot-unstable <patchbot-unstable@xxxxxxxxxxxxxxxxxxx>]

# HG changeset patch
# User Ian Campbell <ian.campbell@xxxxxxxxxx>
# Date 1280503248 -3600
# Node ID 6a0dd2c29999caba75717c7a2472096e34149a0b
# Parent  9f49667fec7197c935c822f7caea64b98007c605
libxc: free thread specific hypercall buffer on xc_interface_close

The per-thread hypercall buffer is usually cleaned up on pthread_exit
by the destructor passed to pthread_key_create. However if the calling
application is not threaded then the destructor is never called.

This frees the data for the current thread only but that is OK since
any other threads will be cleaned up by the destructor.

Signed-off-by: Ian Campbell <ian.campbell@xxxxxxxxxx>
Acked-by: Ian Jackson <ian.jackson@xxxxxxxxxxxxx>
Acked-by: Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>
Committed-by: Ian Jackson <ian.jackson@xxxxxxxxxxxxx>
---
 tools/libxc/xc_private.c |   15 +++++++++++++++
 1 files changed, 15 insertions(+)

diff -r 9f49667fec71 -r 6a0dd2c29999 tools/libxc/xc_private.c
--- a/tools/libxc/xc_private.c  Fri Jul 30 15:22:39 2010 +0100
+++ b/tools/libxc/xc_private.c  Fri Jul 30 16:20:48 2010 +0100
@@ -57,6 +57,8 @@ xc_interface *xc_interface_open(xentooll
     return 0;
 }
 
+static void xc_clean_hcall_buf(void);
+
 int xc_interface_close(xc_interface *xch)
 {
     int rc = 0;
@@ -68,6 +70,9 @@ int xc_interface_close(xc_interface *xch
         rc = xc_interface_close_core(xch, xch->fd);
         if (rc) PERROR("Could not close hypervisor interface");
     }
+
+    xc_clean_hcall_buf();
+
     free(xch);
     return rc;
 }
@@ -180,6 +185,8 @@ int hcall_buf_prep(void **addr, size_t l
 int hcall_buf_prep(void **addr, size_t len) { return 0; }
 void hcall_buf_release(void **addr, size_t len) { }
 
+static void xc_clean_hcall_buf(void) { }
+
 #else /* !__sun__ */
 
 int lock_pages(void *addr, size_t len)
@@ -223,6 +230,14 @@ static void _xc_clean_hcall_buf(void *m)
     }
 
     pthread_setspecific(hcall_buf_pkey, NULL);
+}
+
+static void xc_clean_hcall_buf(void)
+{
+    void *hcall_buf = pthread_getspecific(hcall_buf_pkey);
+
+    if (hcall_buf)
+        _xc_clean_hcall_buf(hcall_buf);
 }
 
 static void _xc_init_hcall_buf(void)

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