blob: 791d9501b8c499991dea4260e4986fe0f47b0c45 (
plain) (
blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
|
//
// Copyright 2019 The Abseil Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include "y_absl/flags/usage.h"
#include <stdlib.h>
#include <util/generic/string.h>
#include "y_absl/base/attributes.h"
#include "y_absl/base/config.h"
#include "y_absl/base/const_init.h"
#include "y_absl/base/internal/raw_logging.h"
#include "y_absl/base/thread_annotations.h"
#include "y_absl/flags/internal/usage.h"
#include "y_absl/strings/string_view.h"
#include "y_absl/synchronization/mutex.h"
namespace y_absl {
Y_ABSL_NAMESPACE_BEGIN
namespace flags_internal {
namespace {
Y_ABSL_CONST_INIT y_absl::Mutex usage_message_guard(y_absl::kConstInit);
Y_ABSL_CONST_INIT TString* program_usage_message
Y_ABSL_GUARDED_BY(usage_message_guard) = nullptr;
} // namespace
} // namespace flags_internal
// --------------------------------------------------------------------
// Sets the "usage" message to be used by help reporting routines.
void SetProgramUsageMessage(y_absl::string_view new_usage_message) {
y_absl::MutexLock l(&flags_internal::usage_message_guard);
if (flags_internal::program_usage_message != nullptr) {
Y_ABSL_INTERNAL_LOG(FATAL, "SetProgramUsageMessage() called twice.");
std::exit(1);
}
flags_internal::program_usage_message = new TString(new_usage_message);
}
// --------------------------------------------------------------------
// Returns the usage message set by SetProgramUsageMessage().
// Note: We able to return string_view here only because calling
// SetProgramUsageMessage twice is prohibited.
y_absl::string_view ProgramUsageMessage() {
y_absl::MutexLock l(&flags_internal::usage_message_guard);
return flags_internal::program_usage_message != nullptr
? y_absl::string_view(*flags_internal::program_usage_message)
: "Warning: SetProgramUsageMessage() never called";
}
Y_ABSL_NAMESPACE_END
} // namespace y_absl
|
