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Implement GNU Make 4.4+ jobserver fifo / semaphore client support
The principle of such a job server is rather simple: Before starting a new job (edge in ninja-speak), a token must be acquired from an external entity. On posix systems, that entity is simply a fifo filled with N characters. On win32 systems it is a semaphore initialized to N. Once a job is finished, the token must be returned to the external entity. This functionality is desired when ninja is used as part of a bigger build, such as builds with Yocto/OpenEmbedded, Buildroot and Android. Here, multiple compile jobs are executed in parallel to maximize cpu utilization, but if each compile job uses all available cores, the system is over loaded.
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,72 @@ | ||
| // Copyright 2024 Google Inc. All Rights Reserved. | ||
| // | ||
| // 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 | ||
| // | ||
| // http://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 <fcntl.h> | ||
| #include <cassert> | ||
| #include <cstring> | ||
| #include <unistd.h> | ||
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| #include "jobserver.h" | ||
| #include "util.h" | ||
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| Jobserver::Jobserver() : token_count_(0), fd_(-1) | ||
| {} | ||
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| void Jobserver::Init() { | ||
| assert(fd_ < 0); | ||
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| if (!ParseJobserverAuth("fifo")) { | ||
| return; | ||
| } | ||
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| const char *jobserver = jobserver_name_.c_str(); | ||
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| fd_ = open(jobserver, O_NONBLOCK | O_CLOEXEC | O_RDWR); | ||
| if (fd_ < 0) { | ||
| Fatal("failed to open jobserver: %s: %s", jobserver, strerror(errno)); | ||
| } | ||
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| Info("Using jobserver: %s", jobserver); | ||
| } | ||
|
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| Jobserver::~Jobserver() { | ||
| assert(token_count_ == 0); | ||
|
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| if (fd_ >= 0) { | ||
| close(fd_); | ||
| } | ||
| } | ||
|
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| bool Jobserver::Enabled() const { | ||
| return fd_ >= 0; | ||
| } | ||
|
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| bool Jobserver::AcquireToken() { | ||
| char token; | ||
| int res = read(fd_, &token, 1); | ||
| if (res < 0 && errno != EAGAIN && errno != EWOULDBLOCK) { | ||
| Fatal("failed to read jobserver token: %s", strerror(errno)); | ||
| } | ||
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| return res > 0; | ||
| } | ||
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| void Jobserver::ReleaseToken() { | ||
| char token = '+'; | ||
| int res = write(fd_, &token, 1); | ||
| if (res != 1) { | ||
| Fatal("failed to write token: %s: %s", jobserver_name_.c_str(), | ||
| strerror(errno)); | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,61 @@ | ||
| // Copyright 2024 Google Inc. All Rights Reserved. | ||
| // | ||
| // 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 | ||
| // | ||
| // http://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. | ||
|
|
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| #include <windows.h> | ||
| #include <cassert> | ||
|
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| #include "jobserver.h" | ||
| #include "util.h" | ||
|
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| Jobserver::Jobserver() : token_count_(0), sem_(NULL) | ||
| {} | ||
|
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| void Jobserver::Init() { | ||
| assert(sem_ == NULL); | ||
|
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| if (!ParseJobserverAuth("sem")) { | ||
| return; | ||
| } | ||
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| const char *name = jobserver_name_.c_str(); | ||
|
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| sem_ = OpenSemaphore(SEMAPHORE_ALL_ACCESS, false, name); | ||
| if (sem_ == NULL) { | ||
| Win32Fatal("OpenSemaphore"); | ||
| } | ||
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| Info("using jobserver: %s", name); | ||
| } | ||
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| Jobserver::~Jobserver() { | ||
| assert(token_count_ == 0); | ||
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| if (sem_ != NULL) { | ||
| CloseHandle(sem_); | ||
| } | ||
| } | ||
|
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| bool Jobserver::Enabled() const { | ||
| return sem_ != NULL; | ||
| } | ||
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| bool Jobserver::AcquireToken() { | ||
| return WaitForSingleObject(sem_, 0) == WAIT_OBJECT_0; | ||
| } | ||
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| void Jobserver::ReleaseToken() { | ||
| if (ReleaseSemaphore(sem_, 1, NULL)) { | ||
| Win32Fatal("ReleaseSemaphore"); | ||
| } | ||
| } |
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