如何在 1.9.2 上安装 SystemTimer？答案

【问题标题】：How to install SystemTimer on 1.9.2?如何在 1.9.2 上安装 SystemTimer？
【发布时间】：2011-12-12 14:35:09
【问题描述】：

我刚刚使用 RVM 将我的应用程序从 1.8.7 升级到了 1.9.2，并且必须添加 RubyGems 和 Bundler，运行 bundle install 并让除 SystemTimer 之外的所有东西都能正常工作。 Google-fu 什么也没返回，我看到其他人在 1.9 中遇到了问题，但有些人已经让它工作了。有什么想法吗？

pawel:bodb pawel$ sudo gem install SystemTimer
Building native extensions.  This could take a while...
/Users/pawel/.rvm/rubies/ruby-1.9.2-p290/lib/ruby/site_ruby/1.9.1/rubygems/ext/builder.rb:48: warning: Insecure world writable dir /usr/local/bin in PATH, mode 040777
ERROR:  Error installing SystemTimer:
ERROR: Failed to build gem native extension.

/Users/pawel/.rvm/rubies/ruby-1.9.2-p290/bin/ruby extconf.rb
creating Makefile

make
/usr/bin/gcc-4.2 -I. -I/Users/pawel/.rvm/rubies/ruby-1.9.2-p290/include/ruby-1.9.1/x86_64-darwin10.3.0
-I/Users/pawel/.rvm/rubies/ruby-1.9.2-p290/include/ruby-1.9.1/ruby/backward -I/Users/pawel/.rvm/rubies/ruby-1.9.2-p290/include/ruby-1.9.1 -I.
-D_XOPEN_SOURCE -D_DARWIN_C_SOURCE   -fno-common -O3 -ggdb -Wextra -Wno-unused-parameter -Wno-parentheses -Wpointer-arith -Wwrite-strings -Wno-missing-field-initializers
-Wshorten-64-to-32 -Wno-long-long  -fno-common -pipe  -o system_timer_native.o -c system_timer_native.c
In file included from system_timer_native.c:8:
/Users/pawel/.rvm/rubies/ruby-1.9.2-p290/include/ruby-1.9.1/ruby/backward/rubysig.h:14:2: warning: #warning rubysig.h is obsolete
system_timer_native.c: In function ‘install_first_timer_and_save_original_configuration’:
system_timer_native.c:46: warning: passing argument 1 of ‘log_debug’ discards qualifiers from pointer target type
system_timer_native.c:53: warning: passing argument 1 of ‘log_error’ discards qualifiers from pointer target type
system_timer_native.c:57: warning: passing argument 1 of ‘log_debug’ discards qualifiers from pointer target type
system_timer_native.c:62: warning: passing argument 1 of ‘log_debug’ discards qualifiers from pointer target type
system_timer_native.c:65: warning: passing argument 1 of ‘log_error’ discards qualifiers from pointer target type
system_timer_native.c:69: warning: passing argument 1 of ‘log_debug’ discards qualifiers from pointer target type
system_timer_native.c:82: warning: passing argument 1 of ‘log_error’ discards qualifiers from pointer target type
system_timer_native.c:89: warning: passing argument 1 of ‘log_debug’ discards qualifiers from pointer target type
system_timer_native.c:96: warning: passing argument 1 of ‘log_error’ discards qualifiers from pointer target type
system_timer_native.c:101: warning: passing argument 1 of ‘log_debug’ discards qualifiers from pointer target type
system_timer_native.c: In function ‘install_next_timer’:
system_timer_native.c:112: warning: passing argument 1 of ‘log_debug’ discards qualifiers from pointer target type
system_timer_native.c:119: warning: passing argument 1 of ‘log_error’ discards qualifiers from pointer target type
system_timer_native.c:123: warning: passing argument 1 of ‘log_debug’ discards qualifiers from pointer target type
system_timer_native.c:130: warning: passing argument 1 of ‘log_error’ discards qualifiers from pointer target type
system_timer_native.c:136: warning: passing argument 1 of ‘log_debug’ discards qualifiers from pointer target type
system_timer_native.c:143: warning: passing argument 1 of ‘log_error’ discards qualifiers from pointer target type
system_timer_native.c:146: warning: passing argument 1 of ‘log_debug’ discards qualifiers from pointer target type
system_timer_native.c: In function ‘restore_original_configuration’:
system_timer_native.c:157: warning: passing argument 1 of ‘log_error’ discards qualifiers from pointer target type
system_timer_native.c:160: warning: passing argument 1 of ‘log_debug’ discards qualifiers from pointer target type
system_timer_native.c:168: warning: passing argument 1 of ‘log_error’ discards qualifiers from pointer target type
system_timer_native.c:170: warning: passing argument 1 of ‘log_debug’ discards qualifiers from pointer target type
system_timer_native.c:172: warning: passing argument 1 of ‘log_error’ discards qualifiers from pointer target type
system_timer_native.c: In function ‘restore_original_timer_interval’:
system_timer_native.c:190: warning: passing argument 1 of ‘log_error’ discards qualifiers from pointer target type
system_timer_native.c:192: warning: passing argument 1 of ‘log_debug’ discards qualifiers from pointer target type
system_timer_native.c: In function ‘restore_sigalrm_mask’:
system_timer_native.c:199: warning: passing argument 1 of ‘log_debug’ discards qualifiers from pointer target type
system_timer_native.c:201: warning: passing argument 1 of ‘log_debug’ discards qualifiers from pointer target type
system_timer_native.c: In function ‘install_ruby_sigalrm_handler’:
system_timer_native.c:211: error: ‘rb_thread_critical’ undeclared (first use in this function)
system_timer_native.c:211: error: (Each undeclared identifier is reported only once
system_timer_native.c:211: error: for each function it appears in.)
system_timer_native.c: In function ‘restore_original_ruby_sigalrm_handler’:
system_timer_native.c:217: error: ‘rb_thread_critical’ undeclared (first use in this function)
system_timer_native.c: In function ‘clear_pending_sigalrm_for_ruby_threads’:
system_timer_native.c:266: warning: passing argument 1 of ‘log_debug’ discards qualifiers from pointer target type
system_timer_native.c: In function ‘set_itimerval’:
system_timer_native.c:290: warning: passing argument 1 of ‘log_debug’ discards qualifiers from pointer target type
system_timer_native.c:295: warning: implicit conversion shortens 64-bit value into a 32-bit value
system_timer_native.c:299: warning: passing argument 1 of ‘log_debug’ discards qualifiers from pointer target type
make: *** [system_timer_native.o] Error 1


Gem files will remain installed in /Users/pawel/.rvm/rubies/ruby-1.9.2-p290/lib/ruby/gems/1.9.1/gems/SystemTimer-1.2.3 for inspection.
Results logged to /Users/pawel/.rvm/rubies/ruby-1.9.2-p290/lib/ruby/gems/1.9.1/gems/SystemTimer-1.2.3/ext/system_timer/gem_make.out

【问题讨论】：

标签： ruby ruby-on-rails-3 rubygems rvm

【解决方案1】：

据我所知，SystemTimer 与 ruby 1.9 无关，也不应与此版本一起使用。

“在 Ruby 1.9 中使用这个 gem 是没有用的，没有任何意义！系统计时器正在尝试解决 Ruby 1.8 (MRI) 中使用的“绿色线程”模型的一些限制。有关更多详细信息，请参阅 http://ph7spot.com/musings/system-timer 。”

【讨论】：

好的，那么在 Ruby 1.9 中应该使用什么来代替 SystemTimer.timeout_after？
好的，看看。 require 'timeout'; Timeout::timeout(5) { ... }

【解决方案2】：

要安装系统计时器，请在终端中使用此命令：

sudo gem install system_timer

【讨论】：

你不想在 RVM 中使用 sudo。
这也无济于事，因为 system_timer 将无法使用 Ruby 1.8.7

【解决方案3】：

SystemTimer 的替代品是来自 Ruby 核心的 timeout.rb。不需要任何 3rd 方宝石。

Ruby 1.8：

require 'system_timer'

SystemTimer.timeout_after(5.minutes, MyException) do
  # your job here
end

Ruby 1.9：

require 'timeout'

Timeout.timeout(5.minutes, MyException) do
  # your job here
end

【讨论】：