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* shared_info.h (open_shared): Create function wrapper for common use case.

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(open_shared): Change fifth argument to a pointer rather than a reference.
* fhandler_console.cc (fhandler_console::get_tty_stuff): Eliminate use of dummy
variable and call open_shared with constant.
* fhandler_process.cc (format_process_mounts): Ditto.
* pinfo.cc (pinfo::init): Pass pointer to shloc.
* shared.cc (shared_mem_inited): New variable.
(open_shared): Crate function wrapper for common use case.
(open_shared): Accommodate change to fifth argument to a pointer.
(shared_info::initialize): Remove spinlock test.  Simplify function.  Move
get_session_parent_dir call back here.
(memory_init): Protect global shared settings with shared_mem_inited spinlock.
Move get_session_parent_dir call to shared_info::initialize.
This commit is contained in:
Christopher Faylor
2010-03-09 21:26:55 +00:00
parent fab7d5988a
commit bd3b3783f8
6 changed files with 85 additions and 47 deletions
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96
winsup/cygwin/shared.cc
View File

@@ -37,6 +37,7 @@ HANDLE NO_COPY cygwin_user_h;
WCHAR installation_root[PATH_MAX] __attribute__((section (".cygwin_dll_common"), shared));
UNICODE_STRING installation_key __attribute__((section (".cygwin_dll_common"), shared));
WCHAR installation_key_buf[18] __attribute__((section (".cygwin_dll_common"), shared));
static LONG shared_mem_inited __attribute__((section (".cygwin_dll_common"), shared));
/* Use absolute path of cygwin1.dll to derive the Win32 dir which
is our installation_root. Note that we can't handle Cygwin installation
@@ -114,7 +115,6 @@ init_installation_root ()
installation_key.Length = 0;
installation_key.Buffer[0] = L'\0';
}
}
/* This function returns a handle to the top-level directory in the global
@@ -216,16 +216,23 @@ static ptrdiff_t offsets[] =
void * __stdcall
open_shared (const WCHAR *name, int n, HANDLE& shared_h, DWORD size,
shared_locations& m, PSECURITY_ATTRIBUTES psa, DWORD access)
shared_locations m, PSECURITY_ATTRIBUTES psa, DWORD access)
{
return open_shared (name, n, shared_h, size, &m, psa, access);
}
void * __stdcall
open_shared (const WCHAR *name, int n, HANDLE& shared_h, DWORD size,
shared_locations *m, PSECURITY_ATTRIBUTES psa, DWORD access)
{
void *shared;
void *addr;
if (m == SH_JUSTCREATE || m == SH_JUSTOPEN)
if (*m == SH_JUSTCREATE || *m == SH_JUSTOPEN)
addr = NULL;
else
{
addr = off_addr (m);
addr = off_addr (*m);
VirtualFree (addr, 0, MEM_RELEASE);
}
@@ -233,23 +240,23 @@ open_shared (const WCHAR *name, int n, HANDLE& shared_h, DWORD size,
WCHAR *mapname = NULL;
if (shared_h)
m = SH_JUSTOPEN;
*m = SH_JUSTOPEN;
else
{
if (name)
mapname = shared_name (map_buf, name, n);
if (m == SH_JUSTOPEN)
if (*m == SH_JUSTOPEN)
shared_h = OpenFileMappingW (access, FALSE, mapname);
else
{
shared_h = CreateFileMappingW (INVALID_HANDLE_VALUE, psa,
PAGE_READWRITE, 0, size, mapname);
if (GetLastError () == ERROR_ALREADY_EXISTS)
m = SH_JUSTOPEN;
*m = SH_JUSTOPEN;
}
if (shared_h)
/* ok! */;
else if (m != SH_JUSTOPEN)
else if (*m != SH_JUSTOPEN)
api_fatal ("CreateFileMapping %W, %E. Terminating.", mapname);
else
return NULL;
@@ -272,7 +279,7 @@ open_shared (const WCHAR *name, int n, HANDLE& shared_h, DWORD size,
if (!shared)
api_fatal ("MapViewOfFileEx '%W'(%p), %E. Terminating.", mapname, shared_h);
if (m == SH_CYGWIN_SHARED && offsets[0])
if (*m == SH_CYGWIN_SHARED && offsets[0])
{
ptrdiff_t delta = (caddr_t) shared - (caddr_t) off_addr (0);
offsets[0] = (caddr_t) shared - (caddr_t) cygwin_hmodule;
@@ -337,10 +344,9 @@ user_shared_create (bool reinit)
if (!cygwin_user_h)
cygheap->user.get_windows_id (name);
shared_locations sh_user_shared = SH_USER_SHARED;
user_shared = (user_info *) open_shared (name, USER_VERSION,
cygwin_user_h, sizeof (user_info),
sh_user_shared, &sec_none);
cygwin_user_h, sizeof (user_info),
SH_USER_SHARED, &sec_none);
debug_printf ("opening user shared for '%W' at %p", name, user_shared);
ProtectHandleINH (cygwin_user_h);
debug_printf ("user shared version %x", user_shared->version);
@@ -382,26 +388,16 @@ shared_info::initialize ()
DWORD sversion = (DWORD) InterlockedExchange ((LONG *) &version, SHARED_VERSION_MAGIC);
if (!sversion)
{
/* Initialize installation root dir. This is put here just to piggyback on the
shared memory spinlock. The installation root does not live in shared_info
shared memory. */
init_installation_root ();
init_obcaseinsensitive ();/* Initialize obcaseinsensitive. */
tty.init (); /* Initialize tty table. */
mt.initialize (); /* Initialize shared tape information. */
debug_printf ("Installation root: <%W> key: <%S>",
installation_root, &installation_key);
cb = sizeof (*this); /* Do last, after all shared memory initialization */
cb = sizeof (*this);
get_session_parent_dir (); /* Create session dir if first process. */
init_obcaseinsensitive (); /* Initialize obcaseinsensitive */
tty.init (); /* Initialize tty table */
mt.initialize (); /* Initialize shared tape information */
}
else
else if (sversion != SHARED_VERSION_MAGIC)
{
if (sversion != SHARED_VERSION_MAGIC)
{
InterlockedExchange ((LONG *) &version, sversion);
multiple_cygwin_problem ("system shared memory version", sversion, SHARED_VERSION_MAGIC);
}
while (!cb)
low_priority_sleep (0); // Should be hit only very very rarely
InterlockedExchange ((LONG *) &version, sversion);
multiple_cygwin_problem ("system shared memory version", sversion, SHARED_VERSION_MAGIC);
}
if (cb != SHARED_INFO_CB)
@@ -422,15 +418,39 @@ memory_init (bool init_cygheap)
}
/* Initialize general shared memory */
shared_locations sh_cygwin_shared;
cygwin_shared = (shared_info *) open_shared (L"shared",
CYGWIN_VERSION_SHARED_DATA,
cygwin_shared_h,
sizeof (*cygwin_shared),
sh_cygwin_shared = SH_CYGWIN_SHARED);
cygwin_shared->initialize ();
for (;;)
{
LONG smi = InterlockedExchange (&shared_mem_inited, -1);
if (smi < 0)
{
low_priority_sleep (0);
continue;
}
if (!smi)
/* Initialize installation root dir */
init_installation_root ();
/* Installation root dir has been globally initialized */
cygwin_shared = (shared_info *) open_shared (L"shared",
CYGWIN_VERSION_SHARED_DATA,
cygwin_shared_h,
sizeof (*cygwin_shared),
SH_CYGWIN_SHARED);
if (!smi)
{
cygwin_shared->initialize ();
/* Defer debug output printing the installation root and installation key
up to this point. Debug output except for system_printf requires
the global shared memory to exist. */
debug_printf ("Installation root: <%W> key: <%S>",
installation_root, &installation_key);
smi = 1;
}
InterlockedExchange (&shared_mem_inited, smi);
break;
}
heap_init ();
get_session_parent_dir (); /* Create session dir if first process. */
user_shared_create (false);
}