spawn() — langchain Function Reference

Architecture documentation for the spawn() function in _execution.py from the langchain codebase.

Function python LangChainCore Runnables calls 4 called by 1

Entity Profile

LangChainCore→ Runnables→ spawn() — langchain Function Reference

Dependency Diagram

graph TD
  ea98a366_f701_dc2d_901d_9954c6c58e48["spawn()"]
  489b9db3_8221_6964_1dd6_b6ee6fd2e645["HostExecutionPolicy"]
  ea98a366_f701_dc2d_901d_9954c6c58e48 -->|defined in| 489b9db3_8221_6964_1dd6_b6ee6fd2e645
  29f56f3f_9ee5_4ab0_ea77_8c7c98917847["spawn()"]
  29f56f3f_9ee5_4ab0_ea77_8c7c98917847 -->|calls| ea98a366_f701_dc2d_901d_9954c6c58e48
  4369ac03_9b6d_38a2_6328_517f16dfa130["_create_preexec_fn()"]
  ea98a366_f701_dc2d_901d_9954c6c58e48 -->|calls| 4369ac03_9b6d_38a2_6328_517f16dfa130
  6592225b_0ebb_d535_96fb_1f481b669d2c["_apply_post_spawn_limits()"]
  ea98a366_f701_dc2d_901d_9954c6c58e48 -->|calls| 6592225b_0ebb_d535_96fb_1f481b669d2c
  235aaeeb_c270_5c14_f276_f59bd26a7819["_launch_subprocess()"]
  ea98a366_f701_dc2d_901d_9954c6c58e48 -->|calls| 235aaeeb_c270_5c14_f276_f59bd26a7819
  29f56f3f_9ee5_4ab0_ea77_8c7c98917847["spawn()"]
  ea98a366_f701_dc2d_901d_9954c6c58e48 -->|calls| 29f56f3f_9ee5_4ab0_ea77_8c7c98917847
  style ea98a366_f701_dc2d_901d_9954c6c58e48 fill:#6366f1,stroke:#818cf8,color:#fff

Relationship Graph

Source Code

libs/langchain_v1/langchain/agents/middleware/_execution.py lines 131–146

    def spawn(
        self,
        *,
        workspace: Path,
        env: Mapping[str, str],
        command: Sequence[str],
    ) -> subprocess.Popen[str]:
        process = _launch_subprocess(
            list(command),
            env=env,
            cwd=workspace,
            preexec_fn=self._create_preexec_fn(),
            start_new_session=self.create_process_group,
        )
        self._apply_post_spawn_limits(process)
        return process