зеркало из https://github.com/mozilla/gecko-dev.git
96 строки
3.0 KiB
C++
96 строки
3.0 KiB
C++
/* -*- Mode: C; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* ex: set tabstop=8 softtabstop=2 shiftwidth=2 expandtab: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef nsCUPSShim_h___
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#define nsCUPSShim_h___
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#include <cups/cups.h>
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#include "mozilla/Atomics.h"
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#include "mozilla/Mutex.h"
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// TODO: This should be a configure option, ideally.
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#ifndef XP_MACOSX
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# define CUPS_SHIM_RUNTIME_LINK
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#endif
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struct PRLibrary;
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/* Note: this class relies on static initialization. */
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class nsCUPSShim {
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public:
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bool EnsureInitialized() { return mInited || Init(); }
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/**
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* Function pointers for supported functions. These are only
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* valid after successful initialization.
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*/
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#define CUPS_SHIM_ALL_FUNCS(X) \
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X(cupsAddOption) \
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X(cupsCheckDestSupported) \
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X(cupsConnectDest) \
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X(cupsCopyDest) \
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X(cupsCopyDestInfo) \
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X(cupsDoRequest) \
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X(cupsEnumDests) \
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X(cupsFindDestDefault) \
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X(cupsFreeDestInfo) \
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X(cupsFreeDests) \
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X(cupsGetDestMediaDefault) \
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X(cupsGetDestMediaCount) \
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X(cupsGetDestMediaByIndex) \
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X(cupsGetDestMediaByName) \
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X(cupsGetDest) \
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X(cupsGetDests) \
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X(cupsGetNamedDest) \
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X(cupsGetOption) \
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X(cupsLocalizeDestMedia) \
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X(cupsPrintFile) \
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X(cupsTempFd) \
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X(httpClose) \
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X(ippAddString) \
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X(ippAddStrings) \
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X(ippDelete) \
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X(ippFindAttribute) \
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X(ippGetCount) \
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X(ippGetString) \
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X(ippNewRequest)
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#ifdef CUPS_SHIM_RUNTIME_LINK
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// Define a single field which holds a function pointer.
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# define CUPS_SHIM_FUNC_DECL(X) decltype(::X)* X;
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#else
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// Define a static constexpr function pointer. GCC can sometimes optimize
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// away the pointer fetch for this.
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# define CUPS_SHIM_FUNC_DECL(X) static constexpr decltype(::X)* const X = ::X;
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#endif
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CUPS_SHIM_ALL_FUNCS(CUPS_SHIM_FUNC_DECL)
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#undef CUPS_SHIM_FUNC_DECL
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private:
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/**
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* Initialize this object. Attempt to load the CUPS shared
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* library and find function pointers for the supported
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* functions (see below).
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* @return false if the shared library could not be loaded, or if
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* any of the functions could not be found.
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* true for successful initialization.
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*/
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bool Init();
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// We can try to get initialized from multiple threads at the same time, this
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// boolean and the mutex below make it safe.
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//
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// The boolean can't be Relaxed, because it guards our function pointers.
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mozilla::Atomic<bool, mozilla::ReleaseAcquire> mInited{false};
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#ifdef CUPS_SHIM_RUNTIME_LINK
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mozilla::OffTheBooksMutex mInitMutex{"nsCUPSShim::mInitMutex"};
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PRLibrary* mCupsLib;
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#endif
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};
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#endif /* nsCUPSShim_h___ */
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