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Add non-blocking Wait() for launched processes

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- New ProcessInfo class to encapsulate information about child processes.
- Generalized the Wait() to support non-blocking wait on child processes.
- ExecuteNoWait() now returns a ProcessInfo object with information about
  the launched child. Users will be able to use this object to
  perform non-blocking wait.
- ExecuteNoWait() now accepts an ExecutionFailed param that tells if execution
  failed or not.

These changes will allow users to implement basic process parallel
tools.

Differential Revision: http://llvm-reviews.chandlerc.com/D1728


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@191763 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Tareq A. Siraj
2013-10-01 14:28:18 +00:00
parent b9dcca8265
commit c269c4f505
5 changed files with 298 additions and 130 deletions
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36
lib/Support/Program.cpp
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@@ -22,30 +22,40 @@ using namespace sys;
//=== independent code.
//===----------------------------------------------------------------------===//
static bool Execute(void **Data, StringRef Program, const char **args,
static bool Execute(ProcessInfo &PI, StringRef Program, const char **args,
const char **env, const StringRef **Redirects,
unsigned memoryLimit, std::string *ErrMsg);
static int Wait(void *&Data, StringRef Program, unsigned secondsToWait,
std::string *ErrMsg);
int sys::ExecuteAndWait(StringRef Program, const char **args, const char **envp,
const StringRef **redirects, unsigned secondsToWait,
unsigned memoryLimit, std::string *ErrMsg,
bool *ExecutionFailed) {
void *Data = 0;
if (Execute(&Data, Program, args, envp, redirects, memoryLimit, ErrMsg)) {
if (ExecutionFailed) *ExecutionFailed = false;
return Wait(Data, Program, secondsToWait, ErrMsg);
ProcessInfo PI;
if (Execute(PI, Program, args, envp, redirects, memoryLimit, ErrMsg)) {
if (ExecutionFailed)
*ExecutionFailed = false;
ProcessInfo Result = Wait(PI, secondsToWait, true, ErrMsg);
return Result.ReturnCode;
}
if (ExecutionFailed) *ExecutionFailed = true;
if (ExecutionFailed)
*ExecutionFailed = true;
return -1;
}
void sys::ExecuteNoWait(StringRef Program, const char **args, const char **envp,
const StringRef **redirects, unsigned memoryLimit,
std::string *ErrMsg) {
Execute(/*Data*/ 0, Program, args, envp, redirects, memoryLimit, ErrMsg);
ProcessInfo sys::ExecuteNoWait(StringRef Program, const char **args,
const char **envp, const StringRef **redirects,
unsigned memoryLimit, std::string *ErrMsg,
bool *ExecutionFailed) {
ProcessInfo PI;
if (ExecutionFailed)
*ExecutionFailed = false;
if (!Execute(PI, Program, args, envp, redirects, memoryLimit, ErrMsg))
if (ExecutionFailed)
*ExecutionFailed = true;
return PI;
}
// Include the platform-specific parts of this class.