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https://github.com/zebrajr/pytorch.git
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a56e057814
This PR is the beginning of attempts to wrap thread-unsafe getenv and set_env functions inside a RW mutex. Pull Request resolved: https://github.com/pytorch/pytorch/pull/119449 Approved by: https://github.com/malfet, https://github.com/albanD
109 lines
2.6 KiB
C++
109 lines
2.6 KiB
C++
#include <c10/util/Exception.h>
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#include <c10/util/env.h>
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#include <fmt/format.h>
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#include <cstdlib>
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#include <shared_mutex>
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namespace c10::utils {
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static std::shared_mutex env_mutex;
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// Set an environment variable.
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void set_env(const char* name, const char* value, bool overwrite) {
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std::lock_guard lk(env_mutex);
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#ifdef _MSC_VER
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#pragma warning(push)
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#pragma warning(disable : 4996)
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#endif
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#ifdef _MSC_VER
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if (!overwrite) {
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// NOLINTNEXTLINE(concurrency-mt-unsafe)
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if (std::getenv(name) != nullptr) {
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return;
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}
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}
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auto full_env_variable = fmt::format("{}={}", name, value);
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// NOLINTNEXTLINE(concurrency-mt-unsafe)
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auto err = putenv(full_env_variable.c_str());
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TORCH_INTERNAL_ASSERT(
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err == 0,
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"putenv failed for environment \"",
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name,
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"\", the error is: ",
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err);
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#else
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// NOLINTNEXTLINE(concurrency-mt-unsafe)
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auto err = setenv(name, value, static_cast<int>(overwrite));
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TORCH_INTERNAL_ASSERT(
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err == 0,
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"setenv failed for environment \"",
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name,
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"\", the error is: ",
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err);
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#endif
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#ifdef _MSC_VER
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#pragma warning(pop)
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#endif
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return;
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}
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// Checks an environment variable is set.
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bool has_env(const char* name) noexcept {
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std::shared_lock lk(env_mutex);
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#ifdef _MSC_VER
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#pragma warning(push)
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#pragma warning(disable : 4996)
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#endif
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// NOLINTNEXTLINE(concurrency-mt-unsafe)
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auto envar = std::getenv(name);
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#ifdef _MSC_VER
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#pragma warning(pop)
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#endif
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return envar != nullptr;
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}
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// Reads an environment variable and returns the content if it is set
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std::optional<std::string> get_env(const char* name) noexcept {
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std::shared_lock lk(env_mutex);
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#ifdef _MSC_VER
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#pragma warning(push)
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#pragma warning(disable : 4996)
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#endif
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// NOLINTNEXTLINE(concurrency-mt-unsafe)
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auto envar = std::getenv(name);
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#ifdef _MSC_VER
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#pragma warning(pop)
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#endif
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if (envar != nullptr) {
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return std::string(envar);
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}
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return std::nullopt;
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}
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// Reads an environment variable and returns
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// - optional<true>, if set equal to "1"
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// - optional<false>, if set equal to "0"
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// - nullopt, otherwise
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//
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// NB:
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// Issues a warning if the value of the environment variable is not 0 or 1.
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std::optional<bool> check_env(const char* name) {
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auto env_opt = get_env(name);
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if (env_opt.has_value()) {
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if (*env_opt == "0") {
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return false;
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}
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if (*env_opt == "1") {
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return true;
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}
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TORCH_WARN(
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"Ignoring invalid value for boolean flag ",
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name,
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": ",
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*env_opt,
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"valid values are 0 or 1.");
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}
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return std::nullopt;
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}
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} // namespace c10::utils
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