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66 lines
2.8 KiB
C++
66 lines
2.8 KiB
C++
//===- llvm/Support/SlowOperationInformer.h - Keep user informed *- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file defines a simple object which can be used to let the user know what
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// is going on when a slow operation is happening, and gives them the ability to
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// cancel it. Potentially slow operations can stack allocate one of these
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// objects, and periodically call the "progress" method to update the progress
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// bar. If the operation takes more than 1 second to complete, the progress bar
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// is automatically shown and updated. As such, the slow operation should not
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// print stuff to the screen, and should not be confused if an extra line
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// appears on the screen (ie, the cursor should be at the start of the line).
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//
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// If the user presses CTRL-C during the operation, the next invocation of the
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// progress method return true indicating that the operation was cancelled.
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//
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// Because SlowOperationInformers fiddle around with signals, they cannot be
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// nested, and interact poorly with threads. The SIGALRM handler is set back to
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// SIGDFL, but the SIGINT signal handler is restored when the
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// SlowOperationInformer is destroyed.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_SUPPORT_SLOW_OPERATION_INFORMER_H
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#define LLVM_SUPPORT_SLOW_OPERATION_INFORMER_H
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#include <string>
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#include <cassert>
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#include "llvm/System/DataTypes.h"
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namespace llvm {
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class SlowOperationInformer {
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std::string OperationName;
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unsigned LastPrintAmount;
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SlowOperationInformer(const SlowOperationInformer&); // DO NOT IMPLEMENT
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void operator=(const SlowOperationInformer&); // DO NOT IMPLEMENT
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public:
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explicit SlowOperationInformer(const std::string &Name);
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~SlowOperationInformer();
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/// progress - Clients should periodically call this method when they can
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/// handle cancellation. The Amount variable should indicate how far
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/// along the operation is, given in 1/10ths of a percent (in other words,
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/// Amount should range from 0 to 1000). If the user cancels the operation,
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/// this returns true, false otherwise.
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bool progress(unsigned Amount);
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/// progress - Same as the method above, but this performs the division for
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/// you, and helps you avoid overflow if you are dealing with largish
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/// numbers.
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bool progress(unsigned Current, unsigned Maximum) {
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assert(Maximum != 0 &&
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"Shouldn't be doing work if there is nothing to do!");
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return progress(Current*uint64_t(1000UL)/Maximum);
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}
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};
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} // end namespace llvm
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#endif /* SLOW_OPERATION_INFORMER_H */
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